The ZZ-430, Fast Burn 385, and ZZ-5 all use the same head gasket (12557236), short block (12561723), and heads. The ZZ-430 difference is in the camshaft and rockers, as you mentioned. I'd be careful with a thinner head gasket, because, as I remember, when I added the the hot cam/roller lifter combo to my FB-385, the valve/piston clearance was OK, but just about the minimum recommended.

I'm not qualified to evaluate your quench inquiry, but I will guarantee that that engine/cam combo will make serious horsepower when properly tuned. Mine is in a 2,500# car, and it flat moves.