I am doing a total overhaul on a 79 malibu. I'm putting a 350 that came out of my C20 into it. i found out that my heads are mismatch (one 350 the other 305) and am getting new heads for it. i know someone with a set but i need to know if they are a good set worthy of a street rod. the casting number is 10110810 and i know that they're 65 cc heads out of a 91 gen. 1 but is that good?