My favorite hauler is a 1976 Ford F150 Super Cab that I bought from the original owner about 5 years ago. After blowing up the tierd 360 that was in it origanlly I found a 4bbl 390 engine out of a 68 Gallaxy and had it rebuilt and balanced. The motor runs great but after it warms up it leaks oil out of the back of the motor some where under the bell housing. This isn't just a little drip. In fact for a couple of minutes after you shut it off it runs a small stream of oil out on the ground. We had a lot of problems lining things up when we went back in with the motor and I am woundering if it is posible that I knocked the rear main seal out of it or could it be something else?