I have a new World 4.500 bore block that I'm building a 572 C.I.pump gas motor for a local customer with FHO CNC ported Stage V street heads, I used a set different set of rods(Manley SS I beam rods) and had Diamond make the pistons. This motor ended up with 11.04 to 1 compression ratio due to me thinking those heads would be 175.0 CC, they aren't shock Their 169.8 CC shruggy
They can make what ever piston compression ratio you want or need as long as you know the stroke, bore size you want, head CC size, rod length and wrist pin size up scope
Most of the other decent piston companies will do that also for you thumbs

Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)