I ran some numbers with the later, low compression 340 pistons, and even with a .028" thick head gasket, and the 63 cc chambers in the 60779 Edelbrocks, the engine is still going to be in the low 8.3-8.5 range for static CR.
I was sure that as is it makes 8.5:1 compression and with Edelbrocks it would be in 9ish range?
You wrote before that it would be mid 9 with 63cc heads right?