does any 1 have the firing order? i found 1-8-4-3-6-5-7-2 .also need a gap size. heads say they are a 74-80 whats the best gap for them?

 

This is correct firing order for a 69-80 350 with a vacuum advance HEI distributor(non computer controlled).Best all around gap for a stock ignition or even with a hotter coil is .045".Really any gap between .035" and .045" will be ok.You may notice a difference if you have a weak coil and try to run a large gap such as .045",should run smaller gap such as .035"

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1982 Z28:355,4 Speed,Lots of bolt ons

 

thank you

 

1-8-4-3-6-5-7-2 since 1955.

Early HEI said .060" plug gap. .045" is probably better, though. A hotter ignition can jump a bigger spark, so start at .045" and experiment with larger gaps .005" at a time.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. 2-1/2" cat-back, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 CC system w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker 2055 headers, 3" Catco cat & 3" catback, restalled TC, Spohn SFCs).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Holley 750VS w/4150 conversion, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).