Re: Differential and Transmission upgrade
I have the 700 (did the swap about 20 years ago) and it holds up great. That said, buy a built 200 and you will be way happier. Nobody was building the 200's when I did the swap, so I had to shorten the driveshaft and modify the crossmember. You don't have to do nearly as much to use a 200, as it is the same length as your old transmission. Another advantage of the 200 is the gap between first and second gears is not huge. the 700 has a 3.06 1st gear and 1.62 2nd gear, and the 200 has a 2.74 1st and 1.57 2nd.
Shifting from 1st to 2nd at 5,000 rpm, the 700 will drop to about 2,600 rpm and the 200 to 2,900. I definitely feel the bog when the car shifts from 1st to 2nd.
I also have a (non-posi) 12 bolt with 2.73 gears and it is a highway monster. 2,000 rpm at about 80 mph. I think low to mid 3 series gears would be perfect.
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'66 Corvette | 352/??? | 4-speed | Wilwood Brakes | 245/50/16
'67 Chevelle | ex-SS396 | 355/700R4 | F-Body Brakes | 275/40/17