Not saying this is your issue and not sure what head gasket you are using but if you are using stock type head gaskets (like FelPro) the head bolt holes in the gaskets are elongated enough theybreach into the valley of the block on those center intake head bolts (see pic). It will suck oil up through there if that area isn't sealed and there is a hole in the head bolt boss (like you have).
If you are running gaskets like this I would swap them out for Cometic ones which don't have those head bolt holes elongated liked that.
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