HELP! New Motor rear main seal Leaks

I have a standard 340 that the machine shop rebuilt the short block 4-5 years ago. Fired it up after it sat for about 2 years. Finally getting to drive the car and the rear mail seal leaks. Any thoughts or ideas. I really don't want to pull the engine.
Thanks FABO

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Well, if you MUST park your car in the living room on your wife's white carpet, I would recommend a drip pan.

:realcrazy: