I had the cheap autolite plugs, PN 26 in mine, heat range was dead on for my motor. Gap as stated above. They are nothing fancy but they got the job done. Your heat range may differ but if nothing else you will have a good starting point. :beers:
I should mention that some big block heads take different plugs, my heads were from a 1972 402, I think that would be the same plug type for your heads "tapered, no washer" but I figure I better mention it just in case. :beers:
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