Engine

Ignition, charging & starting

The strategy stands, with these changes. Carb path: DUI Street/Strip CH33771 ($369.99, OPGI) is the pick. The MSD alternative is Pro-Billet 85551 ($399.95) + 6AL 6425 ($364.95) + Blaster SS coil (~$79), about $845-$870, not the earlier $720-$830. Ignition tune: start the initial advance nearer 10-12 degrees if…

Prices below were seen in search-result snippets or on vendor pages on 2026-10-12 unless marked "price not confirmed". Many vendor pages (Summit, CJ Pony, Holley.com, JEGS, Speedway) block automated fetches, so those prices are snippet-level and should be re-checked at purchase. Prices fetched live from the vendor page on 2026-10-12 (MSD direct, azproperformance, Billy's) are noted as such. Part numbers are only given where they appeared in a retrieved result. See Verification notes at the end for corrections made.

The pick

Good
~$900-$1,300 (refreshed HEI or PerTronix D1001 $325, wires and boots ~$125-$170, Tuff Stuff 140A $146-$171, mini starter $142-$160, Optima 34/78 ~$290, cables ~$100). The earlier $600-$900 was too low.
Better
~$1,600-$2,100 (DUI CH33771 $370, or MSD 85551 + 6AL + coil ~$845-$870; MSD wires $179 + DEI boots up to $68; Powermaster 140A $200-$251; Powermaster 9526 $278-$349; Odyssey or Optima battery $290-$420; big-3 cables ~$150)
Best
~$2,900-$3,700 (HyperSpark 565-309 ~$460-$532 + box and coil ~$150-$250, Dual Sync 565-200 ~$505 if sequential, MSD wires + boots ~$250, Powermaster 200A CS144-style $739 only if loads justify, Powermaster 9526 or 9426 $278-$418, AAW 510347 $960 or Painless 20205 $644, Odyssey battery ~$410, cables ~$150)

If the owner chooses carb (Edelbrock AVS2):

  • Ignition: Davis Unified Ignition (DUI) Street/Strip (CH33771, $370) or MSD Pro-Billet 85551 + 6AL ($845-$870 with box and coil). The DUI has the advantage of being self-contained: no box, no extra wiring, no firewall space for a box. The MSD route has the best documentation and spark energy but costs more than twice as much and needs a mounting location. For a 10.3-10.5:1 engine on 93, the thing that matters most is the advance curve, not raw spark energy.
  • Fallback "Good": a Flame-Thrower D1001 (~$325) is a fair middle path.
  • Tuning (carb): target 12-16 degrees initial (start nearer 10-12 on a high-compression engine if hot-start kickback shows up; neither the DUI nor the MSD 6AL has a start-retard feature, so a low initial plus a quicker mechanical curve is the safer route), all-in by ~3,000 rpm, ~34-36 total on 93 pump gas, with a vacuum can limited to roughly 12-16 degrees. These numbers come from the outintheshop HEI tuning page and from Chevrolet Performance ZZ454 / Blueprint 454 spec snippets (ZZ454 36 deg total at 4,000 rpm; Blueprint 10-16 initial, 32-34 total).

If the owner chooses EFI (Sniper 2 or Terminator X): Holley HyperSpark 565-309 (~$460-$530 US; Sniper 2 also needs Holley 558-329, plus the HyperSpark ignition box and coil, $150-$250 not confirmed) for a Sniper or Terminator X. Use Dual Sync 565-200 ($505) only if they want sequential injection with cam sync. Both give full timing control and let the owner dial in a timing table tailored to a lopey cam and 93 octane. The cost is a cap/rotor that is smaller and a coil that is not in-cap (needs the box).

Wires/plugs: MSD Super Conductor 8.5 mm (31369 or equivalent) with DEI 6" Protect-A-Boot on all 8 plugs, NGK around heat range 7 to start (confirm seat with head maker).

Charging: Powermaster 57803 (serpentine) or 67461-362 (V-belt, polished) (140 A, CS130 style, ~$200-$250). The stock '77 is V-belt, so 67461-362 is the drop-in for Recipe 1 only; Recipes 2 and 3 use the alternator in the Front Runner serpentine kit (section 90 decision). A 140 A unit supports EFI, a Cold Case radiator with dual fans, an electric fuel pump and A/C in typical use, but section 90's load estimate (about 95-130 A worst case at a hot idle, estimates only) shows it is tight with everything on; stage the fans, verify voltage at hot idle, and step to a 200 A unit if it sags. Wire it with 1/0 or 2/0 cable and a mega fuse sized to the charge wire. Skip the 200 A unit unless the audio or accessory plan grows. If the owner buys a new harness (American Autowire 510347, about $960-$1,024), the 175 A mega fuse and 6 ga charge wire are included and the conversion kit is not needed.

Starter: Powermaster 9526 gear-reduction (168-tooth angled bolt) or a PowerMax mini, with an aluminum heat shield and Ford-style remote solenoid if hot-start is a problem. Budget Summit SUM-829105 ($159.99) as a fallback. Verify flexplate tooth count first.

Battery: Optima RedTop 34/78 ($280-$315) or Odyssey 34/78-PC1500T ($408-$420) AGM in the stock tray. Relocation is not needed for this truck.

Why it matters

The '77 Mark IV 454 came with a coil-in-cap HEI, so the cap, coil and module are crammed into a big round cap that sits close to the firewall and the A/C evaporator box. The factory HEI is a good, simple, parts-everywhere ignition, but it was designed for a 8.25:1 emissions-era engine. At the project's 9.2-9.3:1 (the owner's original ask was 10.3-10.5:1) with a lopey cam on 93 octane, the weak points are cap/rotor energy at high rpm, a slow stock advance curve, and a 20-year-old module and coil. A lopey cam also means low idle manifold vacuum, which changes how vacuum advance and the power-brake booster behave (see interactions).

The big fork in the road is fuel. If the owner stays with a carb (Edelbrock AVS2 / Holley Street Avenger), ignition is a conventional curve-tuned distributor and the decision is "refresh HEI vs. MSD/DUI." If the owner goes throttle-body EFI (Sniper 2 / Terminator X), the distributor becomes a locked-out sensor-only part (Holley HyperSpark or Dual Sync) and the ECU controls timing, which is the best way to get ~36 degrees of cruise/WOT timing safely on 93. This section prices both and the pick depends on that decision (system 'Fuel/induction').

Charging and starting are where this truck bites. The A/C-equipped, EFI, electric-fan, electric-fuel-pump build will pull far more than the stock SI-series alternator (roughly 60 A class; verify the one on the truck). Full-length headers on a square-body C10 pass right where the stock starter lives, so a mini or gear-reduction starter with a shield (and possibly a remote solenoid) is effectively mandatory. The factory 454 + TH400 uses a 168-tooth, externally balanced flexplate (weight welded on), so the starter must match and any replacement flexplate must be the externally balanced 454 type.

Options

A. Distributor / ignition

Tier Brand & model Part # Price (vendor, checked 2026-10-12) Link Notes
Good Keep/refresh stock-style HEI: quality GM-type module, new cap/rotor, new coil, curve-tune springs Generic HEI replacement; ACDelco D190x numbers NOT confirmed HEI replacement units seen ~$53-$354 range (various, search snippet) jegs.com Cheapest, smallest firewall footprint. Fine for carb. Out-of-box curve is too slow/too much vacuum (see Fitment). Do not use cheapest import modules.
Good + PerTronix Flame-Thrower HEI (red cap) D1001 $324.99 (OPGI; list $357.95) opgi.com Stock-look HEI, vacuum advance, rated no misfire to 7,500 rpm. D1002 blue cap seen ~$516.61 at JBS (AU/UK-style site; price not US-confirmed). Link for D1002: pertronixbrands.com
Better Davis Unified Ignition (DUI) Street/Strip, self-contained HEI-style CH33771 (OPGI SKU) $369.99 (OPGI; list $407.95) opgi.com Built-in high-energy ignition, no external box (OPGI search snippet: big-block Chevy HEI-style). CH33771 is OPGI's SKU, DUI's own part number was not confirmed. DUI Cross-Fire CH33772 $385.99, DUI Deluxe CH33773 $689.99 (same OPGI site). Cross-Fire link: opgi.com
Better MSD Pro-Billet magnetic-pickup distributor (no vacuum can) + MSD 6AL box + coil Dist 85551; 6AL 6425 85551: $399.95 (msdignition.com, fetched 2026-10-12; CJ Pony DIST128 page shows the same $399.95 and "no vacuum advance", so it appears to be this part, not confirmed). 8361 (same, with vacuum can): $467.95 (MSD). 6AL 6425: $364.95 (MSD direct and NAPA), $354.95 SD Parts, $364.99 Classic Industries msdignition.com ; msdignition.com ; cjponyparts.com "Chevy V8" (SB/BB) billet with magnetic pickup; must run an MSD box. Total about $845-$870 (85551 + 6AL + a ~$79 Blaster SS 8207 coil). Gear is cast iron (MSD sells bronze gear 8471, $95.25, for steel-core cams). Gear-material rule corrected in the integration pass (see section 03 and the Street Muscle compatibility guide): cast iron is acceptable only on cast/ductile-iron cores (COMP "-8" retrofit hydraulic rollers are ductile-iron class), bronze or melonized are for billet-steel cores, and a melonized or composite gear works on any core; confirm the core with the cam maker in writing before choosing the gear. Box needs a mounting spot and wiring; classic, well documented carb solution but twice the cost of DUI. CORRECTION: the earlier draft listed "8362" as this part; MSD part 8362 is actually the Street Fire HEI (self-contained, $229.95, MSD lists it for Small Block Chevy Gen I, red cap) and should not be assumed to fit a Mark IV 454.
Better MSD self-contained HEI-style billet (no box): 8365 red / 83653 black 8365 / 83653 8365: $675.95; 83653: $727.95 (MSD direct, fetched 2026-10-12) msdignition.com Replaces a 4-pin-module GM HEI, internal 8.5 A module + coil, adjustable centrifugal, vacuum can that can be locked out. Engine fitment (BBC tall deck) not confirmed on the page; confirm before ordering. Dearer than DUI for similar function.
Better MSD coil to pair with 6AL Blaster SS 8207 ($78.99 OPGI; $78.15 Walmart). Blaster 2 = 82023 (NAPA page; price not confirmed) See at left napaonline.com (this page is the Blaster 2, 82023, not 8207) Only if you are not using a coil-in-cap. The earlier "8222 $60.29" entry could not be matched to a product and is dropped.
Best (EFI) Holley Sniper EFI HyperSpark distributor, tall deck BBC (Mark IV) 565-309 US: $459.95 sale (was $511.95) per Walmart-listed snippet; black 565-309BK $531.95 (snippet). Billy's Speed Shop is a UK site: GBP 481 (reg. 523.99), not a US price billysspeedshop.com (UK retailer; spec page verified: "Chevrolet Big Block Tall Deck", Hall effect, locked-out, cast gear, ignition box required) Locked-out, single Hall sensor, ignition box required (Holley HyperSpark 2 box, up to 150 mJ, pairs with coil 556-152 per search result; box and coil price not confirmed, budget roughly $150-$250). Sniper 2 additionally needs Holley 558-329 per a search result; confirm on Holley's page. Terminator X/HP/Dominator can use the shutter wheel for timed-sequential. Tall-deck = Mark IV. Cast iron gear: check cam core material.
Best (EFI) Holley EFI Dual Sync (cam + crank sensors; works with Terminator X sequential or Sniper) 565-200 Summit $505.95 (reg. $562.95); Holley $513.95; CJ Pony $493.95; Classic Industries $571.99 summitracing.com (565-201BK black); holley.com (both block automated fetches; not verified). CJ Pony lists it for "all 1960-1987 SB/BB Chevy C10": cjponyparts.com Fits Gen I SB and Gen IV BB Chevy (Mark IV deck-height fitment not stated in the results seen; confirm). Needs an external CD box or coil driver; Holley recommends it for sequential/ComSync setups.
Best (EFI) FiTech Go Spark distributor (alt. EFI timing control) 99013 $389.00 (FiTech site snippet) fitechefi.com FiTech requires a 100% locked-out distributor and an adjustable rotor for timing control; running FiTech on a plain HEI means fuel-only.

B. Wires, plugs, heat protection

Tier Item Part # Price Link Notes
Good Quality 8 mm wires (Taylor / Moroso 8 mm) not researched price not confirmed n/a Not researched this pass; budget ~$60-$100.
Better MSD Super Conductor 8.5 mm, Chevy 454 74-76 HEI vehicle-specific set 31369 $178.95 (msdignition.com, fetched 2026-10-12; the JBS Power Centre page is a non-US site showing $250.53) jbspowercentre.com (non-US) ; msdignition.com Titled "Chevy 454, '74-'76 HEI" (MSD does not list '77): the '77 uses the same HEI cap, but verify wire length/routing against headers (most header installs need custom-length or universal sets anyway). Universal MSD 31259 set seen $120.95 (price source snippet; link via msdignition.com). Spiral-core wires are fine with HEI and with EFI, but keep them away from ECU harness.
Better DEI Protect-A-Boot, 6 in, 8-pack DEI-010542 (titanium) / 0105xx colors ~$43.60 (black) to $56.99 (silver); titanium 010542 seen $67.99 (GenRight) per 8; Summit price not shown summitracing.com 1,800 F rated; essential at #5/#7 plugs near headers.
Plugs NGK, start at heat range 7 for a 9.2-9.3:1 aluminum-head 93-octane street engine (6 only if fouling; per a search-result guideline of 6-7 for 9.0-10.75:1 pump gas) exact NGK part number depends on head (aluminum heads typically want gasket/tapered seat per head maker) n/a gmsquarebody.com Do not guess part numbers: confirm seat type/reach with the cylinder-head maker.

C. Alternators and charging

Tier Brand & model Part # Price (checked 2026-10-12) Link Notes
Good Tuff Stuff 140 A, GM internal reg, 1-wire 7127K6G12 ($145.99, 6-groove serpentine pulley); 7127NK12 chrome ($170.99, V-belt pulley per search snippet; earlier draft said $158.99) as listed (Summit snippet, 2026-10-12) summitracing.com Cheapest 140 A path. Same bolt pattern as CS130; forum owners recommend wiring a factory pigtail rather than a cheap adapter.
Better Powermaster CS130 style 140 A 57803 $199.99 (black, serpentine); 57401 $222.99 (serpentine per Speedway listing); 574021 $227.99 (side post); 67461-362 $250.99 (polished; the 674xx series is the single-V-belt line, e.g. PM674611 "single V pulley") Summit snippet; JEGS 378021-362 $243.99 summitracing.com ; jegs.com 1-wire capable, American-made. Fine for most builds. Pulley matters: a stock '77 454 truck is V-belt. Decision (section 90): Recipes 2 and 3 go serpentine from day one, so the alternator comes in the Vintage Air Front Runner kit (140 A) and the standalone 57803/57401 are not bought; only Recipe 1 stays V-belt and uses 67461-362.
Better American Autowire alternator conversion kit, SI to CS130, internal reg 37796 (per search snippet; CJ Pony SKU WALT24) price not confirmed (page blocked) cjponyparts.com Right if the owner is keeping the factory harness; skip if replacing the whole harness.
Best Powermaster 200 A, CS144-style, 1-wire or 3-wire 67805 $738.54 (JBS snippet; polished, 6-groove) jbspowercentre.com Only needed if A/C + EFI + dual fans + big audio. 140 A is usually enough for this load list.
Best (stock-appearing, cheaper) Wire in a factory-style CS144 n/a price not confirmed gmsquarebody.com Forum report: CS144 on 73-87 is "as simple as wiring in the new plug"; the resistor myth does not apply; V-belt slippage can be a problem, so a 5-rib serpentine swap is better.
Wiring Harness with charging circuit and fusible link; American Autowire Classic Update 510347 (175 A mega fuse kit with 6 ga charge cable, verified on azproperformance page); Painless 20205 ($754.99; the $643.99 in the first draft was a stale search snippet, see the correction below) see left AAW 510347: $960.45 (CJ Pony, Speedway), $976.40 Walmart, $1,024.00 azproperformance (fetched 2026-10-12), eBay $879.99; Painless 20205: $754.99 (painlessperformance.com product page, fetched 2026-10-12; section 16 and 90 use this), older snippets $643.99 / $679.99 azproperformance.com ; painlessperformance.com If the owner rewires the truck (they plan to), this fixes charging for free.
Cables 1/0 or 2/0 battery, starter, engine ground ("big 3") n/a price not confirmed tahoeyukonforum.com Owner reports: 1/0 is adequate for nearly any load; 2/0 if you want headroom.

D. Starters and flexplate

Tier Brand & model Part # Price (checked 2026-10-12) Link Notes
Good Summit Racing SBC/BBC mini high-torque starter SUM-829105 $159.99 summitracing.com 153/168-tooth, 3.73:1, max 14:1 compression, adjustable mounting block, "inline" per snippet. Verify bolt pattern before ordering.
Good JEGS Hitachi-style mini starter 555-10090 price not confirmed (sister JEGS Hitachi minis: 10011 $112.07 rated to 11:1, 10012 $149.97 rated to 16:1) jegs.com Budget option. Pick a unit rated well above 10.5:1.
Better Powermaster PowerMax mini starter 9100 (quick disconnect) $141.99 Summit, $152.99 Speedway, $188.82 Walmart (snippets) speedwaymotors.com
Better Powermaster gear-reduction, 168-tooth angled (staggered) bolt, 4.4:1 9526 $277.99 Speedway sale (reg. $348.75); ~$268-$273 Walmart (snippets) speedwaymotors.com Lightweight, clears headers and oil pans per Speedway; this is the pattern that matches a 168-tooth BBC. Note 454 never came with 153-tooth. Alt: Powermaster 9426 Ultra Torque staggered mount, 153/168, $417.99 CJ Pony (cjponyparts.com).
Best Tilton 40000-series Severe Duty Super Starter 54-40001 (per snippet) price not confirmed (surfaced in search, no URL fetched) Premium, expensive; likely overkill for a street truck.
Flexplate CJ Pony ATF39: automatic 168-tooth flexplate with weight, 454, C10 1973-1987 ATF39 price not confirmed cjponyparts.com CORRECTION: the earlier draft pointed to ATF43, which is the W/O-weight flexplate for the 292 six with TH400 (C10 73-78) and is wrong for a 454. For a performance build use an SFI externally balanced 168T: B&M 20233 ("up to 1990 BBC 454", jegs.com) or TCI 399473 (SFI 168T, external balance 454, seen at enginemaster.com.au). TCI 399554 (the earlier link) is a 153-tooth plate; do not use it with a 168T/TH400 setup. A forged-crank Path A build may be internal/neutral balance; the flexplate must match whatever crank is installed.

E. Battery

Tier Brand & model Part # Price Link Notes
Good Optima RedTop AGM 34/78 8004-003 (Batteries Plus) / 9004-003 (Summit) $289.99 Summit; $279.99 Continental Battery; $304.95 Walmart; $314.99 Batteries Plus + $22 core (snippets, 2026-10-12) summitracing.com 800 CCA, group 34/78 (search snippet: a 1977 C10 is group 34/78 DT). The earlier Walmart link was a group 35, 720 CCA battery and is dropped.
Better Odyssey Extreme 34/78-PC1500T (dual terminal) 34/78-PC1500T $408.00 Walmart; $419.99 Batteries Plus + $22 core (snippets) batteriesplus.com 850 CCA, 48-mo warranty. One forum owner reported a 34-78DT Odyssey slightly small in the tray (shim it). Both are sealed AGM; no vented box required. The earlier "ODX-AGM3478 / $294.99" entry was a different battery (PC925) and is removed.
Best Relocated AGM with a trunk/bed box and 2/0 cable box from Summit-type retailers price not confirmed n/a Only worth it if the engine bay is crowded by A/C, fans, and the EFI throttle body.

Fitment & gotchas

  • Distributor vs firewall/A/C box: A full-size HEI on a big block in a square body fits but is tight; it "will not hit the firewall unless body mounts are really bad," and small-cap options exist (gmsquarebody threads, gmsquarebody.com returned unrelated content; the summary is from the search snippet only). Measure with the new cap before buying. Holley HyperSpark has a "tall deck" fitment, which is what the Mark IV 454 is.
  • Stock starter + headers is the classic square-body problem: a stock starter wears a groove into the header and overheats (gmsquarebody header thread gmsquarebody.com). Mini starter + aluminum shield was the repeated fix; one moderator said modern small-body starters are the best bang for the buck. Blanket vs shield: most owners preferred a shield (gmsquarebody.com).
  • Hot-soak no-crank: if still a problem, a Ford-style remote solenoid was the owner-reported solution (search snippet).
  • Flexplate / bolt pattern: 153-tooth always pairs with the straight (inline) starter pattern; 168-tooth uses the angled (staggered) pattern, and the 454 never used 153 from the factory, so an original 454 is a 168-tooth with a welded external balance weight (Speedway flexplate guide snippet, speedwaymotors.com). Do not buy a flexplate until the crank balance type and tooth count are confirmed. CJ Pony ATF43 (listed earlier in this section's first draft) is the 292-six plate, and TCI 399554 is 153-tooth; neither fits a 168T external-balance 454/TH400. A late-model neutral/internal balance crank needs a different flexplate.
  • Alternator plug and pulley: CS130 and CS144 use the same bolt pattern but different pigtails (oval vs square). V-belt slippage is an issue on a V-belt CS144; consider the later 5-rib serpentine setup.
  • HEI tuning traps: stock vacuum cans give too much advance (22-24 deg), stock springs make the curve too slow, and the module should be a quality OEM-style one (outintheshop HEI page).
  • Distributor gear vs cam: the HyperSpark has a cast iron gear. Cast iron is acceptable on cast/ductile-iron cams (COMP "-8" retrofit rollers) per Street Muscle's gear guide, but not on billet-steel cams; a melonized or composite gear works on any core. Ask the cam supplier in writing (section 03 has the full rule); do not assume bronze or cast iron.
  • EFI timing-control caveat: FiTech can only control timing with a 100% locked-out distributor and an adjustable rotor; a plain HEI means fuel only.

How it touches other systems

  • Fuel/induction: carb means a curve-tuned distributor; EFI means a locked-out Hall distributor and the ECU's timing table. Decide this first.
  • Camshaft: a lopey hydraulic roller has low idle vacuum; vacuum advance will do little at idle and may need manifold vs ported tuning; and it affects power-brake booster vacuum (see brakes).
  • Exhaust: full-length headers set the starter, plug-wire and spark-plug heat problems; header selection should precede the starter choice. Mark the headers' primary routing at #5 and #7 plugs.
  • Transmission/flexplate (corrected after section 07): the TH400 and the 4L80E both use the 168-tooth external-balance flexplate (4L80E: Allstar ALL26825, same Chevy bellhousing pattern, converter bolt circle to be matched with the builder), so the starter does not change; only the T56 changes the bellhousing and replaces the flexplate with a flywheel (section 08). The 4L80E also needs its own controller, wiring and 12 V sources that load the charging system.
  • Cooling: electric fans are a major charging load; size the alternator and wires to the actual fan current.
  • A/C: the evaporator/heater box on the passenger side of the firewall sits near the distributor. Check distributor clearance before purchasing. (This is the cab-side HVAC box, not the compressor; the compressor side depends on the bracket kit and water pump, see sections 14 and 17.)
  • Wiring: if a new harness is chosen, it should include the mega fuse and charge cable; otherwise upgrade the factory fusible link and charge wire.

Check on the truck

  1. Carb or EFI? This decides the distributor.
  2. Is the 454 internally or externally balanced, and what flexplate does it have today? Count the ring-gear teeth and confirm 168.
  3. Which header design (truck-style long tube vs Chevelle-style that tuck up higher) are you planning? It decides starter and spark plug-wire routing.
  4. Will A/C be installed with the factory evaporator box? Measure distributor cap to evaporator box.
  5. What is the cam core material and does the distributor gear need to be steel/bronze?
  6. Is the owner planning a full new harness (then use the charge-wire/mega fuse included)?
  7. Is battery relocation wanted for appearance, or is the stock tray fine?
  8. Any desire for a 200 A alternator (stereo, lights, winches)?

Fact-check notes

Adversarial check on 2026-10-12. Direct page fetches worked for MSD, azproperformance, OPGI/Billy's/JBS Power Centre (non-US), outintheshop and two gmsquarebody posts; Summit, JEGS, CJ Pony, Holley, Speedway, NAPA, Painless and most forum posts block automated fetches (HTTP 403/202), so those were checked only via search snippets.

URLs: 47 URLs HTTP-probed. 22 returned 200 (Summit and OPGI 200s were empty bot-stub bodies, so product details came from search snippets), 22 returned 403 on known-live retailers/forums (not proof of death), 3 Speedway pages returned 202 (bot challenge). No hard 404s. Content-checked: gmsquarebody 660175 (header/starter clearance, confirmed) and 493941 (CS144 on 73-87 trucks, confirmed); 800577 stays flagged unrelated. Wrong-product links removed or replaced: the Walmart Optima link (group 35, 720 CCA), the O'Reilly Odyssey link, TCI 399554 (153-tooth) and CJ Pony ATF43 (292-six flexplate).

Corrections made:

  • MSD "8362 Pro-Billet" was wrong: 8362 is the self-contained Street Fire HEI ($229.95, listed for SBC Gen I). The box-required Pro-Billet is 85551 ($399.95) or 8361 with vacuum can ($467.95). MSD bundle recomputed to about $845-$870.
  • MSD 6AL 6425 confirmed $364.95 (MSD, NAPA). Coil part numbers fixed (Blaster SS 8207 ~ $79; NAPA link is Blaster 2 82023); 8222 dropped.
  • Holley 565-309: $459.95 is a US snippet, Billy's Speed Shop is a UK site (GBP 481). Added the Sniper 2 requirement for Holley 558-329 and the HyperSpark ignition box/coil cost.
  • MSD 31369 wires: $178.95 is MSD's own price, not JBS (JBS shows $250.53, non-US). DEI 010542 titanium seen $67.99.
  • Flexplate: ATF43 -> ATF39 (454, with weight); TCI 399554 replaced by B&M 20233 / TCI 399473 (168T external balance).
  • Alternator: Tuff Stuff 7127NK12 $170.99 (was $158.99); flagged that 57803/57401/7127K6G12 are serpentine while a stock '77 is V-belt (67461-362 or 7127NK12); American Autowire 510347 priced at $960-$1,024 (the tier summary's "$644" was the Painless price).
  • Starter prices filled in: Powermaster 9526 $277.99-$348.75, 9100 $142-$153, 9426 alt $418; Summit mini rated to 14:1.
  • Battery: Optima 34/78 $280-$315; Odyssey 34/78-PC1500T $408-$420 (earlier $295 was a different battery).
  • Plugs: start at NGK heat range 7 (not 6) for aluminum heads on 93 (written for 10.3-10.5:1; the project target is now 9.2-9.3:1, heat range 7 is still the starting point). Added a hot-start kickback caution to the 12-16 degree initial advice.
  • FiTech 99013 price added ($389).

Spot-checked and confirmed: DUI CH33771 $369.99 (OPGI), PerTronix D1001 $324.99 (OPGI), Summit SUM-829105 $159.99, Powermaster 57803 $199.99, 57401 $222.99, 67461-362 $250.99, Tuff Stuff 7127K6G12 $145.99, Painless 20205 ($754.99 on the vendor page fetched 2026-10-12; $643.99 was a stale snippet), AAW 510347 includes the 175 A mega fuse and 6 ga charge cable, HyperSpark 565-309 is tall-deck BBC with a cast gear, factory 454s (to 1990, two-piece rear main) use a 168T external-balance flexplate.

Recommendation check: The picks still hold for this brief: DUI Street/Strip for a carb (simple, self-contained, no box to mount), HyperSpark for TBI EFI, MSD wires with DEI boots, a 140 A alternator with big-3 cables, and a mini/gear-reduction starter with a header shield. Not verified: Mark IV deck-height fitment of Dual Sync 565-200 and MSD 8365/83653, the Powermaster/Tilton 54-40001 price, and the CJ Pony DIST128 = MSD 85551 match.

Tier cost recheck (parts only, pump-gas build, excluding ECU/fuel system): Good about $900-$1,300 (the earlier $600-$900 omitted cables and battery at current prices); Better about $1,600-$2,100; Best about $2,900-$3,700 (including $644-$960 harness and a 200 A alternator if chosen).

Missing options a square-body builder would expect: OEM-style HEI rebuild with MSD/Pertronix module upgrade (covered as Good tier); stock-position serpentine conversion (V-belt vs serpentine alternator choice, noted above); an aluminum starter heat shield/blanket with specific part number (not researched, so not priced); a Holley/Hypermax-style crank trigger option for Terminator X Max (not researched).

Sources 50

  1. cjponyparts.com
  2. msdignition.com
  3. billysspeedshop.com
  4. opgi.com
  5. opgi.com
  6. opgi.com
  7. opgi.com
  8. holley.com
  9. summitracing.com
  10. opgi.com
  11. pertronixbrands.com
  12. napaonline.com
  13. napaonline.com
  14. jegs.com
  15. jbspowercentre.com
  16. msdignition.com
  17. summitracing.com
  18. summitracing.com
  19. jegs.com
  20. jbspowercentre.com
  21. summitracing.com
  22. cjponyparts.com
  23. azproperformance.com
  24. painlessperformance.com
  25. gmsquarebody.com (CS144 on square body)
  26. gmsquarebody.com (starter heat shield)
  27. gmsquarebody.com (headers / starter clearance)
  28. gmsquarebody.com (spark plug heat range)
  29. gmsquarebody.com (UNRELATED/unverified: do not rely on it)
  30. speedwaymotors.com (snippet only)
  31. cjponyparts.com
  32. speedwaymotors.com
  33. speedwaymotors.com
  34. summitracing.com
  35. jegs.com
  36. fitechefi.com
  37. outintheshop.com
  38. jegs.com
  39. knowledgebase.blueprintengines.com
  40. tahoeyukonforum.com
  41. (REMOVED: O'Reilly Odyssey page 403, part number ODX-AGM3478 not verified)
  42. (REMOVED: Walmart page was a group 35, 720 CCA Optima, not 34/78)
  43. 67-72chevytrucks.com (battery tray fitment snippet)
  44. jegs.com (REMOVED from recommendations: 153-tooth plate)
  45. cjponyparts.com
  46. msdignition.com
  47. msdignition.com
  48. jegs.com
  49. summitracing.com
  50. cjponyparts.com