It's not my engine. My friend already has the heads and stroker kit, and wants to drive here and at sea-level on pump gas.
Really, for the application, I would have gone with the 20cc dish pistons, about 10:1 compression and use a smaller cam.

The old 451 engine was a 11:1 engine with less quench, and a tad less cam (251 @ 0.050") than this one.
It should make for a really strong engine, but the pump gas part is the question?