yes, it sounds like the truck was "resurrected" along the way, and the fact that it's missing the door tag may mean the cab was replaced, but it has to be a 55-57 cab with that gas pedal .... the 767 is a paint code [royal blue I think], and the 700's were used 55-58, in 59 they went to 900's according to paint sheets I have
was it V8 when you got it? the fan shroud shown in your album started in 58, I assume that came from the parts truck [rare score]? a 55 with a V8 would have had the rad set back
like this .... as a NAPCO I wouldn't be surprised if the sheet metal had been trashed sometime and replaced, but judging from the "patina" it must have had a complete repaint all at once, you might watch for evidence of another color in hidden places
Bill