So they would be approximately equal to taking 0.060" off the 452s? If so, wouldn't the better flow and the already existing hardened seat be the way to likely proceed?
I do appreciate all the info. Just asking questions before the work gets done.
It depends. If you somehow plan on taking advantage of the quench the closed chamber head can give, then no, IMO, the 452s would not do it. If your plan is to leave the pistons in the hole at TDC, then the 452s would be the better choice.