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As long as those pistons he has are made for a closed chamber head they shouldn't hit. They look like the closed chamber type, I could be wrong though. Call KB and double check.

3909802 3917215 3931063 3964290 These are the head numbers I would go with. They are all 101cc chamber. I would use the thicker Fel-Pro .051" head gasket just to make sure you can run on pump gas. It...

Well, I've already been through all this before with my 396. I had a set of 2.25 valve rectangle port heads on my 396 with KB pistons with a 250 duration isky cam. I clayed the pistons to check...

I think your gonna have problems with your intake manifold bolts lining up. You may want to take these to a machine shop and see if they are worth using. Are you sure they are cut .065? I think that...

I did it. It's not that hard if you know what you're doing. 425 horse should be cake.

Don't go the rectangles unless you plan on getting some massive HP and RPM's out of it. If you want aftermarket heads I'd go for the Brodix aluminum oval ports. They are a 255cc intake runner, so...