Well I managed to get the new pan on. The new alum pan has a thicker flange and it came with longer bolts. The one piece gasket is also thicker. I had to go out and buy some 1.25" bolts. I let her idle in the driveway for about 20 mins. No drips. I revved it and drove it. Still no leaks! As I lay on the floor inspecting the underside I glanced under the '71. There's oil under it! LOL. I got the garage spiffied up again. Later I finished intsalling the final exhaust tubes & hangers. I also rotated the clamps so they were not all pointing to the ground.