rear seal woes

[Shane Sherman <edman@midmaine.com>]

Hello everyone, new to the list. Recently I got my TR3 engine back in
the car after a rebuild, (new sleeves, pistons, head, etc.)  fired her
up, and have a horrific leak out the rear of it. Thinking I had
misaligned the aluminum rear seal, I just ordered a new stock type seal,
and lower end gasket set. Anyone have any tips for this second attempt
at reasonable oiltightness? Any trick to this installation?
Thanks,
Shane Sherman,
'60 sunbeam Alpine
'59 Triumph TR3A