Need help building 416 Stroker!

Okay, so i believe i will be using scat forged 4340 i beams so thank god no clearance needed! Now, what about compression with cast iron x heads? I think i was wrong about the chamber cc with the x heads? Anyone have any idea of the the chamber cc on x heads and what compression can i run for 93 octane? And what kind of power can i make with x heads, 416 stroker, air gap, 800 cfm carb and the cam i advertised? Thanks guys!