Anybody running the '68 4 speed 340 cam?

George Jets said

12 degress (BTDC) Before Top Dead Center is the factory stock setting with Mopar electronic ignition and brain box.

If you are running the Mopar HEI conversion and hotter faster E-core coil, then you need to back it down to 8 degress BTDC, and gap the plugs at .050 ths.

Stock Build 340 with the 4 speed 340 cam.

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i've repeatedly asked @George Jets for any evidence of this "hotter, faster" magic coil and he has yet to post one shred of literature or any facts to back up this suspicious claim. so i'd chalk up that whole "back the timing up for HEI" as piss poor hot rod folk lore.

also we don't need 50 gaps that eat up ignition components. our cylinders are very efficient, it's not like we have pontaics and are trying to eek out 35mpg.

anyway, i just did up a 318 with a 340 4spd cam (advanced 4°) that i was running a e-burg mopar electronic set up and it was delighted with 14°

ultimately, the motor will want what it will want and it'll let you know.