[SC2ner]

Yes sir, over filling the engine can cause multiple issues. As I said before, I would clean the pipe out completely, drain the oil out... might as well do an oil change and check the throttle body and intake manifold for oil. If so, remove and clean. Put the new filter and oil on, and then turn her on, take it for a test drive and see how she performs and then check the intake pipe again. Hopefully the oil seperator is straight. So after running it for a bit you may get a little left overs... clean it out and drive it again.

With how old the car is, I would suggest removing the throttle body and cleaning the carbon out anyways. lol Its more of a preventive maitenence procedure. But in this situation, consider it extra precaution.