You can tell if you are using the stock, plastic vacuum block - it will be deformed in the middle
Concave - near the two bolt heads
Swap out to an aluminum block.
cheap fix and solid upgrade
I'm not clear on whether the oil is leaking from the vacuum block gasket - or if it was noticeable when you removed the vacuum block.
If the latter - join the club.
I've not see a whole lot of weeping oil out from under the gasket but I suppose it is possible.
A smudge here n there, but not running
But a gasket fixes that. 5 bucks
Change that PCV - it is probably shot.
It's really not intended to shuttle tons of oil through the intake system - but crankcase vapors; i.e. blow by; ergo for environmental concerns
If it is sucking a ton of oil, you may have some other things going on.
Obviously, an evac catch can system is preferred for use on the valve covers to evacuate oil suspended in the crankcase vapors.
Install a 3/8" check valve inline with the PCV.
No matter what you hear - they all leak under boost; and allow crankcase pressures to increase.