318 - intake vacuum leaking

Hell yeah it'll leak. You need to have the intake milled to match.
Okay- how do you know what to mill it? Or does the machine shop know that calculation? When my heads were done the owner a guy who has done a lot of machine work for me over the years said it was minimum amount “don’t worry about it.”
Honestly back when these engines were “modern” .100” was nothing to save a warped head and they machined the intake side as well. These were not machined on the intake side.

anyone have that calculation?