Yes it will bolt up and work... they are the same transmission... just take off the tail shaft housing, and put your transfer case right to it.
Need some instructions? It is fairly straightforward, though.
to clearify the question
will a 1990 2wd 400 trany bolted to a 350 sbc replace a 1989 4x4 400 tranny bolted to a 454. and is there any modifications required to the tail shaft inorder for it to fit the transfer case. I have done the 700r swap and replaced with a 350 turbo in the past'
I just don`t want to get this all apart and find out a 2wd is different output then a 4wd
and the taul shaft needs replacing