New to me Barracuda with Mopar Crate 390hp low oil pressure

Who's Pcv did you use?
ME Wagner. Excellent instructions included with the product and website.

i was right at the low vacuum setting of 6-7 so I used low idle spring set to the just 1/8 turn below the 400 engine suggestion.
Then I used my hand to fell the cruise setting, you fell the check ball bouncing, I went 1/2 then clockwise extra once the ball stopped at idle.

no oil leaks after 120 miles.

so I will increase 1/8 turn until I get oil out the breather. Then back off 1/2 turn.