Welcome to the forum
That is a desirable truck IMO. A '63 short fleetside, big back window, with all of the custom cab option trim including the polished aluminum grill. What a great find and will be a nice truck when you are done. I see someone has changed the differential at some time in the past 56 years.
Let me know if you need one of my '63-'66 booster brackets with the hydraulic clutch conversion to go along with your T56.