Welcome.
Stop and think about this. This is exactly the type of project that can cut through an enormous budget, require a **** load of man-hours, fabrication time, mechanical skill and a significant amount of work space with some serious tools.
You leave out a few, but very critical details. They basically; would inquire about all of those things I mentioned above. How much time, money, mechanical ability and space do you have, and how much do you have already wrapped up in the original truck, and set aside to purchase a "donor" chassis/drivetrain truck and all the related little things that will absolutely "nickel and dime" you to death along the way?
Then what are the parent's, wife, neighbor's, city planners and code enforcement guys going to say when all this mess sits out in the open, drizzling what they consider "hazardous" materials (coolant, oil, gear lube, old tires, etc) all over the place? Not just for a few months, but potentially the rest of your life, should you lose interest or hit a budget wall mid-project?
TOTAL BUMMER. I know. We all dream of such projects, the fun, the ease of which it possibly could be done, recycling good things into even better, personally modified and unique things that reflect our hard work, personalities and levels of creativity while avoiding a new truck payment.
More often than not, the overall cost alone will far surpass the cost of a fully loaded new truck, let alone a nice, lower trim level reliable truck that you could press into service immediately and reliably.
That being said, I would LOVE to take the old original Power Wagon in my Sig pic, slide a new 2500 Diesel 4x4 chassis right under it with all the power and reliability. Just slide it on there, bolt 'er up and drive off into the sunset with a unique rig that would either appreciate, be appreciated, or kept for life.
Sadly, those "OverHaulin" type stories are a One in a Million fantasy, and often even with the big production budget, pro shops and celebrity names involved are absolute **** under a fancy painted "demo" shell, like many rigs at SEMA, etc.
Sell the ultra low mileage original truck out of state to a potential collector or "nostalgia" guy who might pay more for it because he learned to drive it in high school, or his grandfather had one "just like it" on the farm where he spent his youthful summers.
Then take the money and get the best "complete" rolling package you can find. It will make itself known to you in time.
OR, add a good limited slip, buy some good chains to cover a nice new set of four used "winter take offs" with studs already installed, some fresh seat covers, a spare tow strap for behind the bench seat when you get in over your head, and just drive the hell out of it!
And work your way up the ladder with better, more experience and bigger budgets as things come your way and life moves forward.
Glad to have you hear. Sorry if it sounds like a "bubble bursting" post, but learn from other's mistakes (such as myself and many others before me who have tried taking this path). And be better off in the long run for it.
-Brakelate-
****I really drove and wrenched constantly on a whole lot of REAL ****** vehicles before finally being blessed with the ability to buy top of the line stuff like my current Rubicon and Power Wagon. But, it takes years... in my case well over 40+! So hang in there. Good things will happen.