Aluminum Intakes dont seal on X heads

I agree with chuck, those heads were probably angle milled for a stock class. I believe this was done for a compression increase without showing during inspection/ I sold a set of heads to a guy a couple years ago who needed late 70's 360 head for this purpose. I don't know if you would have valve interference if you straighted the heads up. Don't waste the money have the intake milled by measuring with a feeler guage as the prior posts said and problem is solved, my.02 Walt ( but what do I know?):cheers: