'80 4000 oil-soaked *air* filter problem...

Yup. After 263K miles, a mystery oil puddle now greets me on the driveway beneath the air cleaner snout. Pulled the filter box off and the air filter is soaked! Drips thru the access hole for the screw that holds the snout on.

Rather copious too....qt every 200 miles or so!

I've dis-assembled the crankcase breather hose junction and cleaned (carb cleaner) all the elbows and the orifice hole. Have un-impeded air flow, bothways, thru all the tubes. Put it all back together and it's still pumpin' oil thru the air cleaner!

The valves and valve guides were replaced about 20K miles ago, and the spark plugs are nice n' grey, so it's not burning oil.

Is there more to the crankase ventilation system that could be causing the pressure/pumping problem? Anything clogged under the valve cover?? The valve guides going south already???

My shop manual is kinda vague (and it's the factory edition!).

I've owned the car, btw, for almost 23 years...2-door model. It's been pretty bulletproof with only the expected (tires, alternator(s), battery(s), CV joint(s), etc etc) replacements. Did the head job as a preventative...compression is still good.

Found this site today via GOOGLE, btw... some *very* good reading!

Any ideas on my problem? Hate to shoot the 'ol hoss in the head!!

'Preciate the help...