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Well that answers the bed swap question I had, but what about the front end? Will the front fenders/hood/grille/etc. from a mid/early 90's truck fit an older one(specifically an '86 f250)? As long as were at it...what about the doors?
Doors are the easiest. There'll be some interference between the top front corners of the door panels and your dash pad, but if your hinges are adjusted well and not too worn, the doors will still seal.
The front clip can be swapped, but the bottom bolt of the fenders just ahead of the doors won't line up. You can make a bracket to join it, but you MUST change EVERY piece of sheet metal forward of the firewall, including the core support, wiper valance, and bumper.
If you have access to a late bed & a late front clip, can't you get a late cab & frame to bolt them onto?