[fdbdw]

I didnt see the t in the line at first, good eye, that would be my first guess. If that line is connected to the pcv I could see oil being pulled into the line from the vacum created by the carb, I would also think either your valve is stuck open or the vacum is holding it open cause the pcv should be releasing vapors no pure oil like your finding in your line. I would also venture to say that you are getting poor performance from your carb and vac advance due to the disruption of the vacum by that oil. Run one solid line from your carb to your dizzy and one solid line from your pcv to the correct inlet on your carb, and check you pcv to make sure it operates freely