Compression ratio estimates

I don't know some of the variables such as combustion chamber cc's, piston design cc's (+ or _)

Go to Keith blacks website and they have a compression calculator you can use to figure up your compression.

I think 302 heads are closed chambers so you should be able to get away with 10.0-10.25 on 93. If their open chamber your best to keep it down to 9.5 to 1

Here's the link to KB's calculators http://www.kb-silvolite.com/calc.php