HP potential for a 9.2:1 360???

You want to use the gasket with the pre-flattened fire ring with those heads or they may work themselves into the head surface and start leaking over time. You should be running the FelPros. Also, with the aluminum, I think you've got a compression problem and the lack of static will be felt. I doubt it will make 400hp without some larger cam and rpm which makes it less streetable. I'd lose the RPMs for a set of EQ Magnums. They aren't big coin and will retain more heat in the chamber, and can be run with any gasket.