Before you can make it even GO, You should make darn sure it will STOP SAFETY! Any brake components this old should be completely disassembled, inspected and any rubber lines or rubber parts replaced with NEW! Any wheel cylinders should be re sleeved or replaced, Brake lines should be replaced. There is no room for error built into these trucks like the modern Power Brakes or Dual Master cylinder or anti lock brakes. Those Steering wheels and that metal dash look VERY unforgiving of a frontal crash especially with NO Seat belts. My face does NOT want to find out how it feels if the steering wheel and dash STOP faster than I do! New parts are available from all the classic venders but first check for parts with your local FLAPS. They most time will surprise you with what they can get! And don't be afraid to ask here for help or advice Just my humble opinion. Jerry
