I hear ya Dennis - best thing to do is ask an expert - too many keyboard advisers that never built an engine giving advice makes it even tougher!

If your going roller - I have some cam specs from that 512 I built - that might be what your looking for

The hefty just got its chassis certification good to 8.50 - it's almost ready to go - just gonna do some touch up on the primered spots - did not get a chance to do the paint this year - should be out soon