Oil burn cloud on engine deceleration

Can you put a 5/8-3/4" barb on you air cleaner? I run a non-atmospheric breather with a hose fitting (much like the original Mopar ones) to the air cleaner.

PCV valves can go bad, mainly gummed up but even after cleaning they can fail to seat.
I don’t know what kind of “barb” you are referring to.