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I would guess you gaulded the piston from lugging it, or you cracked a piston skirt from rev'ing it when it was cold. Either way, its got excessive blow by now which is over pressurizing the crankcase and manifesting itself at your PCV valve which can't keep up and oiling down the top of your intake manifold. Simply, excessive leakage around the piston would explain all the issues your talking about.

A leak down test will rule this out or confirm it, but this is where I would start looking.
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