Another vote for 33’s and 3.7 diff gearing.
As or even more important is get your steering components tight and geometry right. Castor shims are your friend…
Whatever you do dont take it apart to “Restore” it…. Thats a perfect truck with an amazing history.
The obvious comments about fluids and a tuneup are spot on of course. None of that makes the truck yours however.
Ask yourself what’s the state...