Spark Plug Question

When I got this car it never had these drool tubes and to be truthful have no idea what they are. The guy I got the car from over a year ago said that the guy that had the vehicle prior put different heads on, mild cam, and a long tube header. I am unsure what kind of heads they are. The car runs great and has no problems I just wanted to ask to make sure that it was ok to have just a little bit of oil on the threads. Thanks everyone