I would say do the typical rears up front/chevy 63" rear set up with hi-steer.  This will take a good 40 hours of noise, grinding and welding though.  Look at a bunch of build threads on here and you will get the idea of what you will need.

  If you have to get by with bolt on, I just set up my '80 with old man emu and it's not at all bad.  More of a work truck suspension.  The rear is pretty stiff but the front flexes very well with longer shocks and the torque rod removed and it's plenty capable.  This a set up you could build on later when life allows more time and noise  .  Here is the thread...  https://board.marlincrawler.com/index.php?topic=102594.60


Here is a poser shot:

What is the intended use for the truck?

I purchased my '85 Extended Cab truck with a 3.5" Pro Comp lift that included blocks in the rear.  At that point it had 32 inch tires and was otherwise stock, but performed ok and I did quite a few of the Moab trials with this setup.  Then I stepped it up to a 4.5" Superlift that eliminated the blocks in the rear.  The front Superlift springs actually flexed reasonably well, but the rear springs had almost no travel which translated into being really stable for climbing in Moab.  With the Superlift setup I moved up to 33 inch tires, lockers, 4.88 differential gears, and a single 4.70:1 transfer case and it performed extremely well off road.  After a few seasons, I replaced the rear springs with Alcans and a short block and it improved the suspension travel and ride quite a bit.  I always ran OEM steering with these setups and only extended the link that runs between the frame and bracket on the front axle.

My current rig is an '89 4Runner that is running Alcan springs all the way around.  OME (as previously suggested) is possibly a better value and an excellent project, but Alcan is an option that can give you a better ride and more travel because it's based on your individual specifications.  I think the Alcan standard lift for Toyota's extends the rear springs by 5 inches so you'd have to install another spring hanger.

If you're not planning to change the differential gears I would recommend that you not exceed 32 inch tires.  When I stepped up to 33 inch tires I made a quick jump from the 4.10 to 4.88 gears.

Lots of sound advice here! And those links are perfect. I have read a few things on swapping in chevy 63's/installing my ifs box/hysteer etc but I will study those specific links, thanks!

The purpose of the truck is for it to be primarily a "capable" backup vehicle but also something I can have fun with if I choose to. Though, for the most part it will be used to get me to the creek/lake for fishing. 

With that being said, it sat for 5 years and I have been pretty busy with it the last few weeks getting some of its loose ends tied up before making the major upgrades.