brakes
Ok so what I found today was not much. I am online at work with over 15 auto part suppliers, and the only thing I found is advance auto parts shows the rear wheel cylinders and the rear brake hose, they are order items, but only a few days.
So you will have to find everything else, or make something else work, brake shoes should be no big deal, need to figure out what size drums you have, diamiater and depth, use late model adjusters and spring kits, may have to do a little cutting on the shoe base to make the adjuster fit right, or the shoe to fit the wheel cylinder, drill a few holes in the backing plate to stick the hold down pins through, but it all can be made to work.
How about just changing out the rear end to something more modern, 8&3/4 from a dart or something like that, I bet there is something out there the same width, spring mounts can be fabbed and welded anywhere to make it work.
A weekend of work making the brakes work, or changing the rear end will be a lot better than what you have now, NONE !!!