Looks like a 55-2 with a 1956 hood. Any Four Wheel Drive parts would have been dealer or owner installed.
Look on the drivers side door post for the stainless steel chassis serial number. By 1955 most States were using this number on the paper title, earlier vehicles could have the engine serial number on the title. As mentioned above the frame is also stamped on top of the frame rail above the front axle, it will not have the series number, it will start with the year.
The engine serial number is located on the machined surface by the distributor for the straight six and on the pad in front of the passenger side head on the V8's.
Mike B
