I ended up running two PCV and two screw in breather caps, one of each on each side on my old 518 pump gas street 400 stroker motor I had a old set of Cal Custom cast aluminum valve covers on it with a single PVC and breather cap on the other side, it would push oil out of the breather cap when racing it on the weekends shifting at or above 7000 RPM I added three more breathers caps which helped but did not cure the oil pushing out the caps, adding two PVC with two caps did end up curing it
I do make and use a crankshaft scrapers also, they help I run six quarts in a stock 1970/1971 Mopar Street Hemi, 440 six pack oil pan also, I do not overfill it