If it is indeed a 470, there were lots of options available and you can't really go by by books. You just have to see what you have got. Springs could come with or without torque rods, different amount of leaves, etc. If it has a 302, that would have not been available in 1949. There are two possibilities, either the engine was a transplant or the coach builder used split window service cabs to build the integral sleeper. The seller listed it as a 54. Did he have any documentation pointing towards 54? The fact that it has spoke adapters in the rear points to the fact that it was probably a tractor at one time. And it appears to have the clamps on the steering column for a trolly valve. A 400 series frame was quite a bit different than a 300 series. A 300 was more like a beefed up pickup and a 400 started leaning towards being a scaled down truck.
