Intake manifold pulling oil

The guy I bought block from drag races with me and he got it out of a junk yard several years ago and didn’t use it for a while, had it punch out .30 and he says they did not deck it. The intake sealed prior to the head work so still scratching my head on why it won’t seal now. The head guy doesn’t have a mill to deck the surface either and told me he didn’t mess with faces of the head. I’m going to go in depth and check everything you guys have mentioned and check everything 3 times and see what I come up with