Nice project, & it's a complete truck. Half your battle is over already, it's all there & in one piece, (and the price was right).
Getting the GM master parts & repair book for that truck would be your first good investment. It will help replace/rebuild most everything on the truck & it have your adjustments & alignments & most important, part numbers. eBay should help you locate one quick if you can't find one in Stovebolt for sale?
As Grigg said, keep it simple & inexpensive till you find out if it runs or not. But before you take it around the block, take the time to go through the brake system good. Sitting outside for 10 years probably wasted the rubber seals on the brake cylinders, & the brake lines may be partly gummed up from old fluid. If the fluid leaked out from sitting, now you may have dry crusty particles in the lines that may not show up right away, but will destroy brake cylinders later. Flush & blow the lines out good & replace or rebuild the brake cylinders/master cylinder. New springs & shoes would be a good investment to. Once the brake system is done, you won't be going back to finish what you didn't do the first time.
Keep it simple but keep it safe
