Just fininshed this swap.
Was running a t350.
The 700r4 sits behind a new ZZ4.
Drive shaft shortenend about 3".
Used the existing crossmember.
Running a TV cable from a 93 Camaro.
Rear ration 3.73
Purchased a Certified 700R4 from my local Buick dealer. It was from a 91 Corvette with a 2200rpm stall. Cost $1500.
You can click on my build thread below for more info.