welcome aboard
you an change the IDK under chassis to ford B, ford builds their own truck chassis, if it has a ford nose and something non ford behind the hood it's a "B" chassis, same as a "F"series truck without the cab,
somewhere probably in/on the front overhead their should be a body mfg tag with seating capacity etc that will identify the body, ie; thomas, carpenter,amtran,bluebird etc.
once you locate all of the component id tags you can start an online search for info on all of your parts and pieces.
It helps to identify who is close to help you if you put your general location on your id info.