318 with blow by

So your PCV valve is not hooked to the carb/intake?!? That's your problem!!! The PCV valve hooks to the throttle body with a 3/8" piece of hose. This allows the engine to suck and burn all the fumes from the crankcase. Take a look at the factory setup, or post a picture of what you have. You should have a PCV valve in one valve cover and a breather in the other (to let air in) . The Mopar style breather connected to the air filter, but took in unfiltered air and has an internal filter. The reason it hooked to the air filter housing was to keep the engine compartment clean.

One side benefit of a properly working PCV system is drastically reduced oil leakage. The engine isn't trying to force oil out everywhere.