Aluminum Intakes dont seal on X heads

I dont think they were angle milled, but they were definately milled. I think they cut the intake sides and ends to make it fit. Like BJR sasid, they should have cut the intake flange of the head if possible so every intake fits...But... a mismatch of that level may be the result of a large cut. I wont mill more than .040 off the intake flanges, because you're cutting into the valve gasket sealing surface and I want that to remain thick as possible. So when milling heads or decks more than .040, I will mill the heads and intake, or just the intake so they all fit. The one paying me knows this. The one he sells the gine to years later may not. But, your machinist should be able to easliy fix that in any case.