I have the same rules & am using these on 2 engines.sealed power h405P 1.637CH with 10cc valve reliefs. badger flattops B290 1.576" You might check the offerings on eBay for 360 pistons & check their CH's. You just about need to mockup a shortblock & see how far in the hole they are & CC the heads & the available head gaskets felpro 8553pt/1008/1008/cometic. my last 8553pt's compressed to .053". Best would be to splurge for some custom pistons ($$$) to get .040" quench & be a hair under 9-1. precision measureing required. I'm sharing that last tip (quench) for you on the condition you do not race over here!