Help! Intake manifold won't fit!

I milled the heads on my 273 and after bolting them on found that the intake wouldn't fit. Instead of using up another set of head gaskets, I had the intake milled. No problem other than the heads and intake should stay together as a matched set.
A easy way to see how far off your intake is, line up one side, finger tighten the bolts and look at the other side bolt holes.