[blykins]

Can you email or text me a pic? 502.759.1431

It's a mystery as to whether or not that head actually exists. Most believe that the molds were worn out and it's actually a C5 cast number, which would make it a factory 427 MR head.

If it is, then the chamber sizes on those were in the upper 80's, which would mean that you would need to find a replacement head similar to that size. The Pond heads would be the only ones that I could think of, otherwise your compression ratio would go sky high with an Edelbrock, BBM, Survival, etc.