Will an A-833 tran. fit my six?

Ive been talking to a guy about his A-833 transmission. It came out of a late 80's pickup and he said it worked on his 70 /6 pickup.
Will it work on my 70 /6 Duster???
Both are 225's, and he said I would need to adapt it and that there are tons of articles about swapping auto. trans. to A-833.
Can anyone help clarify this for me?
The E-bay item ends in a couple of days.