My brother is doing some upgrades to his 67 Mustang 351W; Flowtek aluminum heads and a Victor Jr intake. Problem: the intake won't sit down flat. It will hit one "rail" or the other on the head. We've never heard of this, but I'm asking if this is more common that we have experienced? His old Holley Dominator intake sit down fine. Our planned fix is to mill about .030" off each side of the intake. That's NOT the gasket surface. Well, I guess it is the top of the gasket surface. But it won't affect the gasket or sealing. Has anyone run into this? Thanks.