Like I said.. the head I'd want to port has the intake manifold integrated into it. You can't unbolt it. It's part of the head. It would make a thorough porting very difficult. Unfortunately I think I'll have to wait until I can afford the Classic Inlines aluminum head and separate intake manifold.. and for what that costs, I'll send that to a professional for porting.. but maybe I'll do the heads on my Mark VII, someday..