Hello I would like to help you.
You can Swap the 7.3 into your Truck. The Ford Truck f350 chassis are basically the same all the way to 1997.
The best thing you should do is see if you can get the whole donor Truck. This way you will have all of the wiring, and anything else you will need and it will be a lot cheaper that trying to piece it together.
I have done several Engine swaps in other vehicles and having the donor car or truck is a big help.
All of that Stuff would need to come from the Diesel Truck.
This is what I meant by getting a donor truck with everything.
The engine will fit but you need to have everything else to go with it.
Motor mounts, radiator, wiring, transmission, gauges...etc the list can get long.