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Stock is .35 but since you have aftermarket ignition I assume coil is hotter as well so i would open them up to .45. Use copper core since they are more conductive and spark easier and perhaps index as well. You should consider getting the old factory "fuelie" heads and ram's horn ex manifolds.

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Q: What is the spark plug gap for a 1966 283ci with eletronic ignition?
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