A functioning PCV will only really open up when the vacuum of the engine allows it. Idle and cruising are when vac is at peak.
The stub I connected to is at the extreme bottom edge of the carb, may as well be on the intake.
My edelbrock RPM doesn't have a stub as far as I can see.
Any
oil in the form of fumes/gases is therefore introduced under/after the carb's finer workings and as people say will tend to lean out the a/f mix.
I can't see it being a problem.
Tim