im tring to get a base idea of how many points each cc in the combustion chamber and compression ratios go to help pick me out heads for my car. i know stock are 64cc and im looking at afr 195s but they have a 58cc combustion chamber. so what would each compression be thanks guys

 

On a typical SBC, a fairly accurate rule of thumb is that each cc is worth about 0.10:1. So if you have 10.2:1 at 64 cc, then swap to 58cc using the same head gaskets, you should be around 10.8:1. And this is about as accurate if we replace the 10s with 9s. 9.2:1 to 9.8:1
It's not exact, but it is safe enough.