Aluminum Head Thread Repair

[Shoebox]

I have a pair of pretty decent 8ba Edmunds heads that I would like to use after some work. The thermostat housing bolt holes were apparently stripped at some point and the bolt holes on both heads to varying degrees were grossly drilled out and re-tapped. I believe they're beyond thread inserts like Time Certs, and should probably be welded up, drilled and re-tapped. Before I go down this rabbit hole I wanted to bring this up on the Barn. Thank Youl