Rebuilder pistons with the 22 cc "bathtub" dish, a zero deck [10.295-10.300"] and the D0VE-C heads 75-77 cc should yield about 9.7-9.8 to 1 C/R
That is the key !!! 22 cc dish pistons at ZERO deck.
The typical builder piston has a 1.752" compression height. These pistons would require a deck height of 10.282". In an uncut early block that would net .018" below deck. Darned near .040" below deck in a late 10.322" deck height block.
My calc says:
9.91 to 1 at 0 deck with a 72 cc chamber
9.66 to 1 at 0 deck with 75 cc chamber
9.5 to 1 at 0 deck with a 77 cc chamber
9.15 to 1 at .018" below deck on early block
8.8 to 1 at .040 below deck in a later block.
We have had to deck the later blocks some .035" or a tick more to get 0 deck with the short compression height builder and sealed power pistons.
I have noted early 460's that were unopened and they are typically .010" below deck and a small dish. The later engines were .030" or better with a much larger piston dish OEM.
When I started checking piston compression heights, dish volumes and such I was shocked at the miserable oem c/r in the later engines.