You can make about anything fit, but the easiest swap would likely be a TH400 due to the crossmember location, BOP pattern available, and approximate length and size.
A TH350 would also go in relatively easy, a 700-R4 can be made to fit.
Why not a 200-4R?
If this is a driver, and not a racing setup, you don't want to give up the OD.
im hearing so many stories about these trans its ridiculousim just sick of my trans pausing in between 1-2, and everytime i adjust the tv cable it doesnt make a change in performance at all, read my post called help, and you'll understand what im saying
