Should be about a zillion of them available, with flat tops you would want something with a combustion chamber around 74 cc, I would think anything from 72 cc to 76 cc would be fine, stock cast iron Chevy heads are probably the most prolific item around. I built a 383 with flat tops and single valve reliefs, cc'd the heads and did the math and I'm at 9.5 : 1 with 74 cc heads. GM used those from the very early 70's through the early 80's. Call your local machine shop, mine keeps some on hand that they have deemed ok to build. I've got only one set of extra heads but shipping would probably be a killer.
Last edited by 78buckshot; 01/26/2022 1:17 PM. Reason: added info
