Dave, do you valve covers have baffles in them? My small block Indy covers only had a breather in each one with no provision for a pcv valve. I drilled a hole for a pvc valve and welded in baffles in each one then plugged the breather on the pvc side. It's turned 7200 several times and never blew any oil out or had any in the pcv hose.

When it was on the dyno it picked up 3 hp with the pcv valve hooked up on back to back pulls.