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Finishing, hopefully, my broken manifold studs adventure, I completed the needle gunning and Dremel rotary brushing of rust down to bare metal without creating/findng any more holes. So I patched the hole in the head as described in my 3-01 post (pic, patch at center). I then primed and painted and reattached the manifold and mixing elbow. The engine now runs fine. As several responders warned, more holes may occur.
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