The 51 is just a frame and an engine it is being built to de sold as a retired factory original frame for someone to set their cab and bed on to have a completed truck faster I also have a 49 frame that I am doing the same with. Will have to find a good 49 engine for it at some point though. I hate seeing any piece of any of these old trucks to go to the scrap pile so every chance I get to save any part I do it.