Your PVC system needs to be corrected as you say. The solid valve cover cap needs to be replaced with a vented cap to make the "inlet side" of the system, or use a cap with hose that goes to air cleaner assy. Best to have some sort of "inlet" filter, either a metal screen built into the cap, or a small foam filter in the air cleaner/hose connection.
Then on the pvc valve, the valve fits into a rubber grommet on the opposite valve cover to the "inlet side". The hose from the PVC valve goes to intake manifold vacuum. Some carbs have a hose fitting built into the carb base, many other setups have a fitting built into the intake manifold just below the carb base. This fitting is not to be confused with the fitting for power brakes which usually is on one of the intake manifold runners leading one cylinder.
With engine idling, and with good piston ring seal, a correctly working pvc system can be checked as follows: Take the cap off the "inlet side" of the system (not the pvc valve side). Place a small piece of paper towel over the hole in the valve cover. The scrap of paper will be drawn down onto the valve cover and held there by the vacuum created in the engine oil pan/crankcase by the PVC valve.
So in summary, the intake manifold has high vacuum with engine idling, this pulls a vacuum thru the pvc valve, which pulls vacuum thru the engine crankcase, which pulls vacuum at the valve cover "inlet" side of the system causing the scrap of paper towel to be held against the valve cover by engine vacuum.
Then clean all the dripping oil off everywhere, and if leaks continue, the previous posts all have correct things to inspect.
