Adjustable PCV valve

I've seen intakes with ports for the pcv and some have been discolored with oil residue.
The PCV has to be connected to the proper port on the front of the carb, just below the butterflies; so IDK what you have been seeing.
If your engine has no blow-by, then just hook up any old PCV that fits and routs easily. This is not rocket science. Your carb will need readjusting. Just make sure you start with a properly adjusted transfer-slot exposure, and modest idle-timing.
As mentioned ; make sure your valve covers are properly and adequately baffled, and every thing will be fine.Don't forget the breather has to work in BOTH directions.