A 700r4 would be a decent choice. I'd do a few things to it like an upgraded input shaft to get rid of the snap ring and a corvette servo. On a stock 350 in a first gen bird, that should do it. You could go further with a beast shell, kevlar band and upgraded frictions and steels if you wanted a bit more room for growth.
the 700's steep 3.06 1st gear will really help out that car with the 2.56 in it off the line. I'd also keep a short 26" total wheel/tire height.
The only issue I really see with the 700, is that with the 2.56 gears, your overdrive gear becomes incredibly tall. Too tall IMHO. I think the car would ultimately benefit from having a 3.08 put in it at the same time, or as funds are available. Do a posi at the same time. Going to a 3.08 with the 700 gets you a starting line ratio of 9.42 which is going to be a lot of fun. Then, the over drive with the 3.08 ends up at a 2.156. It would be more fun around town stop light to stop light while also being great on the highway.
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-Jason
1969 Pontiac Firebird
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