Ok, all you engine rebuilders, I need help. About 7 years ago, a freind of mine and I rebuilt a 283 Chev. New cam bearings, new rings, new cam, new lifters, new valve springs, pretty much just a standard rebuild. He only started the motor once, but never got the car he was going to put it in finished, so the motor sat. Before he stored it, he sprayed WD-40 inside the cylinders. I recently acquired the motor for my 50 chev. I took the heads off to make sure there were no mouse nests or anything inside. The walls were still shiny, and the motor turned over just by wrenching on the harmonic balancer, so it was not froze up. I installed the motor, and it fired right up. I have about 500 miles on it, now all of a sudden, it is starting to smoke. Blue smoke, so that means oil. It seems to be getting worse. I notice it more as I am sitting idling, but if I rev it up, I will get a puff of blue smoke, then nothing until I let it idle again. What could it be? Valve guide seals dried up? Rings not seating? I need help, I want to drive the car to Hunnert Car pileup, but this has me worried. Any suggestions?