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Don't worry about the motor, worry about the ignition system. I take it you must be using an HEI distributor in the vehicle to warrant a .060" gap. Be aware that GM reduced this to .045" gap due to longevity issues. If it's not an HEI, I believe the .035" is correct. If you are running the same ignition you were using before the swap, gap it as you had it ...

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