The original motor (350) in my 79 Z28 was worn out so I bought a rebuilt 350 that had been sitting for 2 years (never run since it was rebuilt). The owner says he'd place oil in the spark plug holes and turn the crank every month since rebuild. I had it installed and it fired right up and runs great. The mechanic says it's leaking 1 drop of oil every 15 seconds from rear main seal where the chrome oil pan connects. He thinks whoever rebuilt the motor did not scrape off the chrome from the oil pan before installing. Or he says if they did, it should have dried out from sitting for 2 years. Any ideas or thoughts about what I can do here besides replacing the seal? Is there any chance som kind of stop leak could help? Thanks.