How far is the piston siting below or above the hole?

I'd look at the profiler sniper JR intake, Holley Ultra Gen 3 950cfm dominator, 9.5:1 range, and Lunati's voodoo marine camshafts.

They have a 240/245 112 LSA, or if you wanna turn it a little harder, 245/250 112. They are a nce line of camshafts, that are proven lobes, stable, without excessive lift, or excessive exhaust duration. The 651 crane is a nice cam, but with 244/256, it works better in a boosted combo with mediocre exhaust flow.

Just my opinion.

Can't remember if you mentioned racetec or autotec pistons in earlier post but you may find the right cc for your combo there also. I just went through the same ordeal. Good pistons and reasonable. Just thought I'd throw that out there. They had exactly what I needed for my 565's.