intake milling
You need to use the same formula for milling the intake when you mill the heads and or block. Mathmatically, it doesn't matter if the material comes off the block deck or the heads. Just add the numbers milled off the block and heads together and plug that into the formula and you'll have the proper amount to mill the intake. I don't remember the formula, but I'm sure it's easily found online.
Here, this is it: Combustion deck removal amount X 1.2 = Material to remove from intake port side.