TH350,TH400 or 700R4

[bsstb]

I was wanting to get ya'lls opinion on what tranny to rebuild and put in, my 67. Let me give u a little background on it. It has a custom 383 stroker with custom ground Isky Cam (don't ask me demensions on it right now as i don't have the paperwork infront of me) the engine builder who built it says that it would work great with and automatic, and not a manuel. Due to the cam profile. So what do you think i should get 350, 400, or 700R4.