I am working on mine Today to fix a Leak at rear of Engine. Been leaking since I rebuilt it about 10.000 Miles ago.I used the Best Neoprene seal when I assembled it. Followed Ted's Instruction Sheet. When I pulled it apart Today I verified that the Seal was in facing the correct Direction with the Lip facing towards Engine. The Nails in side Seals were in correctly. There's traces of the Black Sealer at the Bottom of the Seal Retainer and on the Parting Surfaces. I can see on the Crank a nice outline of where the Seal has been riding. I can't see where I did anything incorrectly. I do have a new Best Set to go back in. I am hesitant to try and replace the upper Half because I don't see how anything could be wrong with it. Bottom half is good.I am working on my back under the Car which is not real conducive to working comfortably.  Trying to get the Upper Seal replaced may be more trouble than its worth as its only been in for less than 10,.000 Miles. Any Suggestions? The Leak seems to be from rear main. The Valley Cover was modified using tapped machine Screws so its not leaking. The Flex Plate for Convertor is clean and dry so I don't think its the Cam Plug. By the way the Pan will come off with #5 at TDC but the Sway Bar needs to be unbolted and moved out of the way. I don't remember that ever being mentioned before. Cutting the Bracket off where the Steady Rest used to bolt on would be helpful too..Looking for any input before I put this back together. Thanks