The 4 spd I got was out of a maxima 81-84. Yes the whole thing bolts right up to the l28. I am sure that if Todd could have used the bellhousing from the 3n71b he would have used it instead of finding a 4n71b bellhousing from a maxima. His car was originally a 3 spd auto.
There is more to it than bolting it up and driving it than regular transmission swap. Transmission tunnel brackets need to be cut out, new brackets made and thrubolted in the tunnel, shortened driveshaft.
If you read the articles section about the swap on zcar you will see what all is needed.