Sounds like a similar setup to mine except I'm running a '68 Quadrajet. My block is .040 over too. I think my compression is around 9.5:1 with the pistons I have. No matter the casting number, stock 4bbl D-port GTO heads for '68/'69 are all 72cc.
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Ken
'68 GTO - Ram Air II 464 - 236/242 roller - 9.5” TSP converter - 3.55 posi (
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'95 Comp T/A #6 M6 - bone stock (
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