To answer the question about the two boxy sections on the dash; the one next to the ignition switch is the ashtray. Pull out at the top to tilt it out. They can be somewhat stiff. If you push down on the snuffer (the "ring" on the top whenyou pull the ashtray out), then continue to pull on the top, it will come out of the dash. That was to allow for cleaning it put. The other one next to the glocebox door is a filler plate. On trucks with the deluxe heater, the controls, which are similar to the '55-'56 Passenger controls, would go in that hole. Base heater or delete option trucks got the blank off plate. Since that one has a switch in it, it looks like it got a dealer installed heater. That was a common place for them to put the switch either dealer install or aftermarket (my '55 was the same way).
