I'm not sure if this is a cure or something you've already read about, but I just installed a ME Wagner duel flow pcv valve on basically your same motor. I was noticing blow by and gaskets weeping oil. Once dialed in per their instructions it appears the weeping has quit and oil blow by has been solved too. They suggest an oil catch can to be plumbed inline. I picked up a moroso can but haven't plumbed it because I'm not sure I need it. Time and miles will tell if I do I guess. If you haven't looked into them, maybe see what you think.
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