A last resort if nothing else works ...
This doesn't work for me as I have the 4.2 (1987, pre-FI), and anyway my problem is very likely the rings as I have already cleaned out the valve cover from the inside out and replaced some hoses, PCV valve, etc.
So as a last resort, I attached a very long hose to the breather in the back of the valve cover, and ran it all the down past then engine, under the frame, and just over the tailpipe. The oil still leaks, but now it's nowhere near my engine and most of it burns off on the hot tailpipe when I park it.
Too much of a jerry rig for my taste, but it'll do until I have the time to rebuild the engine - or swap in the Chevy SB. In your case, I'd try the other fixes first, of course, but if it doesn't do it maybe this will buy you some time before the rebuild.