machine shop charge to mill the intake? Just curious. That is pretty fast service! Around here it might get done in a month or two.
I milled my heads intake flanges .040 because that is what I milled off the decks. My intake manifold fit perfect before (I milled the heads) and after. I didn't touch the manifold.
Being that your intake was warped, you did the right thing.
68 Cougar XR7 street and strip car, 428 4-speed, 3560# of fun, new best 10.43@131.2 1.47 60 ft