TH350 external seals/gaskets

[that_ry_guy]

Good morning. Looking for a little help from the transmission gurus out there. I am cleaning up my TH350 to go back into my project. It was working well a year ago so I think the internal components are fine. Obviously there is a problem with some. Oil leakage (spent yesterday scraping crud, decreasing today). Hard to pinpoint the exact location. My question is which seal/gaskets should I change to cover all my bases? Was thinking input and output shafts, shift selector, oil pan. Anything else you would replace?

Thanks for the advice!