So there are 2 different systems we are dealing with here.
PCV, Positive crankcase Ventilation. Where the carbs/injection system draw a measured amount of air from the crankcase via a PCV valve using manifold vacuum. And..
CV, Crankcase ventilation. Where the natural blow past of the combustion process positively pressurises the crank case where this pressure is allowed to escape via a controlled environment (back through the engine's combustion chambers) or out to the atmosphere (preferably via a catch can and filter).
The way I see it in your case, With only one PCV attachment, disable the valve so air will move through it freely and feed this either directly into the carburettor side of the air filter. This way all nasties get burnt through the engine and the vented air becomes part of the ordinary combustion mixture. If you are blowing a lot of oil out the breather, feed it via a catch can then into the carburettor side of the air filter. Don't feed the breather on the intake manifold side of the carb. This will upset the mixture severely. Had something similar but different
with a warped valve cover on the brake booster (the white round thing) where it was letting in air causing the cylinders nearest to where the vacuum hose entered the manifold to run very lean. (this is never good).
PCV's are used in a designed system. They can't just be put in willy nilly because they look good. (as CB has already mentioned
)
I suggest you have a talk to an engine tuning specialist if in doubt with your car at hand.
Getting an engine bay looking right is not always easy but very rewarding.