1991 Ford Tempo

Sounds like your engine is worn out! What your experiencing is piston ring blow-by! Compression is leaking into crankcase and coming out anywhere there's an exit! Normally PCV valve has it covered but not when it becomes excessive! But if the car still runs fine then who cares? But since you said it didn't do it before gasket change as far as you remember, you might pull pcv valve and check it for function.