Don't cut the heads and intake if you're looking for more compression. Cut the block deck, way more compression to be gained than cutting the heads. The best part of cutting the deck is it effectively lowers the heads causing the intake to sit higher up over the intake parts. This allows you to port match the intake roof on the heads to the intake sitting higher up. The heads kind of curve down at the top of the intake port anyway and this will allow you to straighten that curve out. The effort is more than rewarded in compression gain and an improved port follow.