That makes perfect sense! The reason I wasn’t going to use the 318 heads was because 1) the valve seat dropping out made me unsure of the rest of the seats, and 2) there was a little bit of damage to the #3 combustion chamber around the perimeter. I’ve attached a picture. Another reason I wasn’t sure about the heads was knowing how hot they got (at least the driver side) and was worried about warpage. Those reasons combined made me go in the direction of new heads.
BUT, if milling then is the way to go, then warpage wouldn’t be an issue, and I think the little bit of damage to the rim combustion chamber could possibly be corrected after a mill job. Sort of a 2-for-1.
That still leaves the valve seats. Obviously one needs to be replaced, but what to do about the others? Replacing the others won’t be cheap, but I don’t want to risk this whole scenario happening again.
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