Distributor filling itself with oil

As throttle/rpm increases, manifold vacuum decreases till none, after that, blow-by increases to overwhelm that small pcv hose.
Normally plumbed the excess crankcase pressure blasts up the vent tube, filtered into the air cleaner, then into carb and burnt.
You need the vent to relieve crankcase pressure at rpm, or it'll blow oil out the dipstick tube, and everywhere else it can, including uphill into the distributor .
Good luck .