Hello!! I had a talk with Wally Booth, a while back about p/c seals on a street motor!! Long story short, p/c are not good on a street motor, because the high vacuum in the intake and on decell manifold vacuum go'es way up!!! The p/c tephlon seal will let to much oil by!! Wally told me they went back to umbrella seal's and that fix the problem!! I would also use the more modern type of silicone seal with the coil spring on top!!! So i would bet that is your problem! Of course there could be a piston ring problem to! Do you have a pcv valve hooked up to? Pull the hose off the back of carb and see if there is oil in the hose! Do sum more checking before you have to take it apart again! Keep us informed what's going on! Good Luck!!!