I'm wary of the 700R4's. You can get a good one or bad one depending on whether the case is warped enough to put the bearings and drive line in a bind. In any case I don't think they hold high HP (>350) very dependably. Check out Project33.com; he had some issues for example, albeit on a more serious engine. My neighbor's son built a 400 SBC with a 'race' built 700R4 that crapped out early and often. I still don't know if he got that resolved. Many other horror stories out there on them!

Kitz