You might have a possible intake manifold leak as well, that's a somewhat common issue in the FE. If the PCV investigation yields no results, pull your spark plugs, see if any are
oil soaked or discolored. That'll start you down the trail of learning where the
oil is entering your combustion chamber(s). You'll need to start tearing into the engine to learn where the pil is entering the chamber to be burned. First step is pulling the intake and look for telltale signs of intake gasket failures and/or a poorly machined and fitting intake. If you find you have "Print - O - Seal intake gaskets, you may have found your issue right there. Good luck.