Question about 47 - 53 pickups

[Ltcrazyx]

I was wondering how the titles worked on pick up trucks for these years. I have a truck with a title but I see no real way that they can identify that that title goes with that truck. I was also thinking about buying another pickup of this same year and using my current frame because I have already begun to restore it. I was thinking about maybe possibly getting a body from a truck with no title what so ever. Is their any identification plates i'd have to change? I know in newer day cars they have the number in the window. I know the truck doesn't have one of those they just have a small plate on the door frame that is faded away on my truck. Plus in magazines they sell these plates as replacements and say you should have a machine shop stamp in some number. I forget what # it was possibly the title #? Thanks in advance.