700r4 200r4 transmission

Hello Everyone, I am new to the forum and look forward to being part of it. Now on to business. I have just purchased a 62 Nova with a Ramjet 350, 700R4, 3.08 posi rear end, on 195-60/14's and I am just getting to know it. After driving a few days in town and on the hiway I have questions about...

I am in the process of swapping out my Muncie M-21 for an overdrive automatic transmission. I have had the car since 1999 and am just tired of shifting. My Nova has a GM crate 350 H.O. I think i'm in the ballpark of 350hp or so. Some people are telling me 200r4 and some are saying 700r4. This...