Let me get out and see what numbers I have. I think it might be original because the truck is relatively low mileage and the engine appears to be the original yellow color without any sign of anything being disturbed. It was built in Atlanta according to the VIN and has spent it's entire time about 40 miles away until I took it to South Carolina. I bought it from the son of the original owner but he was'nt sure what size the engine was. The truck sat in a shed type building for years and hasn't been registered since the mid seventies. I am the first person to ever title it because Georgia didn't title autos in the 50's. It has power brakes I think but the master cylinder and booster are separate from each other. The vacuum line runs to the intake and the brake line appears to leave the master cyl and run into a small part behind the booster then to the wheel cylinders. It also has a vacuum operated 2 speed rear axle. I'm more familiar with late sixties and seventies Chevy's with V8's but the truck is fascinating and I'm getting a real education on this site. There will be a lot more questions about things as I go through the different parts of the truck. I do appreciate all of the advice and help.