Definitely sounds like a proper fix on the carb wells.
The other possibility that I have not seen mentioned yet is it could be oil getting sucked past the common wall head bolt? It was mentioned I think one bolt boss was thin enough it had a crack. If the rocker studs can have oil sucked last them when they are not sealed up, the head bolt could possibly pull oil in if it was broken thru and not sealed up enough. It probably would not take much, that common wall bolt is at a really high vacuum area at the bowl.
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