+1 ^^
All engines using pistons and rings have "blow-by", blow-by is the gases and pressure that "blows-by" the piston's rings when a cylinder fires, piston rings are metal and they travel up and down on metal cylinder walls so there is no "air tight" seal.
Pressure in the cylinder when it fires can go from 150psi(9:1 compression ratio) to 1,500psi in less than a second, that is how the engine produces power, high pressure against the piston pushes it down to turn the crankshaft, but some of that pressure "blows-by" the rings.
The cylinder walls receive a constant coating of oil to cool and lube them, as this hot high pressure gas blows-by the rings it will vaporize some of this oil, this is what creates the oil vapor and pressure in the crankcase area of the engine, and it is quite normal and expected.
As an engine gets more hours on it(miles) the rings get worn and more pressure blows-by the rings, this is also expected but reduces engine power and makes for higher crankcase pressure and more oil vapor.
In the "old days" there was a tube on the lower block or upper oil pan pointed down at the ground, blow-by pressure and oil vapor were vented out of the crankcase via this tube.
This of course was a major source of air pollution and oil on the roads/driveways.
(those old enough will remember that intersections with stop signs and lights were skating rings after the first rain, lol, rain would float all that blow-by oil, from people sitting at the intersection, to the surface...........more than a few accidents were caused by that.)
The PCV(positive crankcase ventilation) system was added to minimize this pollution.
The crankcase area and valve cover areas are connected via the oil drains in the head(s).
Tube was removed from lower engine, so only air flow access was dipstick tube or valve cover ports
An engine runs with 18" of vacuum(-8psi) pressure in the intake.
PCV Valve was added to the valve cover with a hose to the intake, and a vent hose was also added to the valve cover(oil filler tube or cap) and run to air filter.
The PCV valve will allow engine vacuum to pull most of the oil vapor into the intake to be burned with the gasoline.
The Vent hose is there because engines change over time(rings wear down), on newer engines the Vent allows air to flow in so vacuum pressure doesn't get too high in crankcase, as blow-by increases the vent allows excess blow-by to be vented to engine air flow and be burned same as it would be if it passed thru PCV Valve.
PCV system also reduced oil leaks, the slight negative pressure in the valve covers and oil pan lessen the chance of oil leaking out gaskets.
So as said check your PCV Valve, and hose, also vent hose, all need to be clean and working.
Using a good grade oil will mean less oil vapor as well.
On an '83 engine you probably do have worn out rings, and if you don't plan on rebuilding anytime soon then I would look at adding an oil catch can to the system.
Google: pcv oil catch can