Any tips on my third attempt to properly install a poly rear seal in an 83 turbo engine? Original seal was rope. It was dried out from sitting in the rebuilders shop for 2 years. It leaked big time. First replacement try was engine out. Second and third try...engine in. All three resulted in Niagra falls oil leak. Checked oil pan and its tight. I checked for major blow-by, but its not bad for a new rebuild. Also checked for crankcase pressure and added a PCV and put a vacuum line on another valve cover vent just to make sure. The engine works great otherwise, but I'm piggin up the neighborhood with my dribblin' bugeye.