I'd follow what TClederman wrote in his post pretty closely.
My course of action would be get it running to make sure it will run ok.
Then work on the safety aspects so that is safe to drive before you attempt to drive it beyond the driveway and sometimes it isn't advisable to drive the length of the driveway without rebuilding the brakes and checking out the steering.
Seat belts : INSTALL THEM PERIOD I don't give a rippy doo dah what the "I'm smarter than every one else" guys say, mount a good set of seat belts in the truck with solid mounts. My wife still packs scars from falling out of the 48 34 years ago when she rolled out of the door backwards when it flew open when we rounded a corner. Luckily we were only doing about 5mph but she spent several hours in the emergency room having gravel removed from her knees and having her face cared to. It isn't about the trucks being exempt from seat belts because of age or what not it's because the stock door latches will and do pop open if they are worn a bit and you or yours will fall out of the truck. The first week I had the truck in 1973 I rounded a corner a block from the house and the driver's door flew open and I was hanging from the window opening with one hand on the wheel and my right foot grasping the front of the seat to stay in. I went straight to the Chev dealer and bought new latches( you could still get them at the dealer then).
