I plan on running yota axles also. 84-85 years are the stoutests, they have alot of extra gusseting from the factory. I would run at least 35's on em. And fer gawds sake, don't get thornturds!!
I think an exo should be minimalistic. Build a stinger, run a bar from about the height the headlights back to a bar going up and over the top of the windshield, and a bar going over the cowl. Bar over the B pillar, and connect the 2. Make the back simple too keep the weight down. Build some stout sliders to run the exo off of also.
Post pics!