Hmm. I really doubt that absence of cooling overheated a small part of the head. The comparison I was talking of was between 440-1 heads. Have you talked to Indy to get a dimension on a head bolt boss? I still think you should nail down just how much has been taken off the face. Otherwise I fear you may end up chasing your tail.

Thought, according to Mancini, the as delivered chamber cc is 75 cc and can be milled to 62 cc. What is your chamber cc? This may give you an idea of where you are.