I would like to see what it looks like if you do it.. if you don't mind.. I have an 84 and don't have part of my bed due to rust.. can't live too awful far from you either
the wheelwells should be in the same location. They may be smaller in 2wd than 4wd.... I doubt it will directly bolt in, but the brackets needed would be east to make.
I was gonna do it on my old 84, I am 99 percent sure it will bolt right up if I remember right and the body lines will even match up, they'll just look a bit different. So I say go for it.
if both truck are short bed all body mounts are identical. if its a extra cab all body mounts are identical. i know someone who has done this he bought a bed direct from toyota brand new off the shelf and it bolted right up to his 84 extra cab.