Quench is the issue on a NA motor. I think some chamber work on your current heads would help greatly.
BTW- a one point drop in CR is about (give or take) 25 to 35 hp.
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64 Vette Roadster 400 ci
1990 F150 351 ci SuperCharged
48 Harley Pan Head 76 ci
2016 Nissan Altma
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