I finally got around to taking the upper off and taking a look inside. What I found was very light coating of oil on the intake ports in the cylinder head, definitely not a lot of oil to be found in there. The gasket between upper and lower had some oil on it as well, but there was no oil at all in the upper or lower intake manifold runners. One thing to keep in mind is that the car has been sitting without being started for about 5 weeks now, so whatever the oil might have been there could have leaked down by the valve. Looks like I will be pulling the lower intake off, and changing the gaskets in order to achieve better seals. I've got fresh plugs in the motor, so after another track day I will pull the plugs again and check to see if there is oil on them again. What's a little disappointing is that I was expecting #3 runner to be swimming in oil (since the spark plug was), and it looked same as the others, which leads me to believe that oil ring on that one is toast.