I have a 41 Plymouth hot rod that I've been assembling for about 8 years. I just got around to cranking it a couple of weeks ago and I have an oil leak problem that is making me crazy. The engine is a mid 70's 360 with a rear sump oil pan. When I built the engine, I used a light blue one piece pan gasket, not sure of the brand. After driving it, it leaked around the front seal. Reluctantly, I installed a 4 piece seal set. The first time I tried it, the front seal kept slipping inward on the PS. The second time, I glued it in and let it sit overnight. I pulled it up square this morning and let it sit for a while. After taking it for a short run, I smelled oil again. When I got it up on the lift, both sides of the front seal had pulled in and broke the tits off the seal. I'm at the point now where I believe the Dorman rear sump pan has a bad flange on it......unless you can convince me otherwise. The problem is, rear sump pans are very limited and I don't have room for a deep pan. What are my options? Have you heard of this problem before? I cannot remove the engine without totally disassembling the front end and I do not want to do that, if possible. I can drop the front of the pan about and inch and a half and the rear 3-4". I may be able to drop the rear of the transmission and raise the front enough to get this pan off. I will investigate that tomorrow but for now, I'm looking for options. Thanks.