400 budget compression HELP +++++

Throwing some notional numbers at the problem. Assuming stock bore and stroke, 4.400 gasket .021 thickness, 90cc heads and .080 piston in bore, that's 8.1. Going to 80cc heads bumps that to 8.8.

You can plug in whatever numbers you have .
Engine Compression Ratio (CR) Calculator

S/F....Ken M