Would the older 64 cc heads have the neccesaary accessory bolt holes for your emmisions, alternator, and A/C ?

I've bought and sold 2 '76 vettes. It takes a very special buyer to care about the heads. The key matching is on the block pad and the pillar. If they match, good for 95% of vette guys.

I say, unless the car has under 60K on it, go for it.