What was
@RustyRatRod saying? .030 and you don't need to machine the intake surface? Here's the formula:
~ Milling Formula ~
Mopar 340 & 360 Cylinder Heads
* To reduce Cylinder Head Combustion Chamber {By 1.0 CC} ............... Mill > .0048"
* For every .010" Removed from the Cylinder Head or Engine Block Deck.
* Amount to be removed from Intake Side {Manifold of Cylinder Head}.. Mill > .0095"
* The Cylinder Block Intake Rails {or Intake Manifold 'end-rails'} may also
require milling, to ensure a proper fit.
* For every .010" removed from the Cylinder Head or Engine Block Deck.
* Amount to be removed from the 'end-rails' ...................................... Mill > .0144"