360 cam selection

JMO. I would not mill heads to increase compression. It takes a BIG cut to make an appreciable difference. Machine shops will charge extra for making big cuts, because they take several passes. That means more time. More money. Plus, factor in cutting the intake manifold. That will be a big cut, too. More money. It's not just the money issue, but now you will have a specific pair of heads and intake that can only be used with each other. There are better ways to go about, IMO. Of course, that's just my opinion. Take it for what it's worth.