Aaron, That is a good looking truck. Welcome to the SB. Lots of great people and very good information.
Jim Carter and American Classic Truck Parts are decent to get parts from.
You should read the first to post in the Big Bolts forum about wheels and tires and brakes. Grig has done a wonderful job of gathering information and sharing his knowledge.
I'm sure lots of things going through your mind about what and were to start.
I would put things in this order...
-Make it stop. Doesn't matter if it runs, if it can't stop you really shouldn't go any further
-Tires. Make sure you look at the wheel article and don't do any work to the RH-5 wheels.
-Go through the fuel system. Clean tank, new fuel lines (metal and rubber), new fuel pump, carb kit, etc.
-Change all fluids. It would be a good time to have the radiator checked by a shop. Maybe a new water pump if it's been sitting for many years
-Electrical. Look into a new harness if it has the original. You could spend years fighting an old harness or put a new one in and be done. Maybe upgrade to 12 volt.
Then you can work on the other things.
If your 48 is anything like my 46 some of the parts are compatible. Cab, doors, grill are the same, but running boards and fenders are different. Engine is close to the same, but axles, brakes, etc. are bigger.
Good luck and take your time!