I was really pleased to read that you plan to test two sets of C Yblock head on the dyno. I want to know if these "closed chamber" heads as opposed the the G heads more open style do require LESS total spark advance ( as the Chevy Vortex heads you have mentioned ) and DO SUPPORT higher compression ratio as the Ybock engineers interpreted Ricardo theory on cylinder head design.

The advance in camshaft theory since the Hot Rod / Edelbrock 1956 tests on the Ford 312 will be very interesting to follow and absorb and I look forward to see the results. Pete