I am buying a new tranny and I need to figure out which if these would be my best bet. This is what I have: 88 350 Chevy, converted to carb. Probably makes about 280 hp. Rear end is either a 2:73 or a 3:23, I pick it up next saturday. This is all going in my 51 Chevy. The car is a total cruiser, but a little off the line grunt would be fun. So I need to figure out which of these trannys would suite me best. I can get them all from a local rebuilder for the same price and with the same warranty. The 700r4 has the OD gear which is nice, but I think the case is bigger, and I am not sure if it will fit the tunnel. I know the th350 will fit, but its only a 3 speed. THOUGHTS??