Confused on PCV system for 360 magnum

If you got blowby, It must be able to vent and the air cleaner is a good place for it as it will get ingested and reburned. Usually magnum valve covers don leak as their gasket surface is machines unlike the cast LA heads. PCV doesnt do **** at idle (very little bleed) , its closed, imagine where all that crankcase pressure is going when its closed? I'd not even run a stock PCV valve with a performance cam, just a breather and a 1/2 to the bottom of the air cleaner inside the filter footprint. It will draw air in through the valve cover breather, pick up all the crankcase crap and reburn it. If you do run a PCV with a performance cam, the low vacuum developed by the cam will trick a stock PCV into opening at idle, creating a vacuum 'leak' at idle and fouling up your A/F. Try getting an adjustable one.