Ford did not offer factory AC in their trucks until about 1967-68.. The '57-66 F100/250, etc. generally had after market AC with the unit hanging under the center of the dash.. If the truck was a four speed the stick had to be heated and bent into a very lazy S. The compressor, a York Style vertical unit, mounted on the of the right front corner of the engine, over the generator and cross over pipe.
I had a '64 F250 w/292 for about 18 years, it had Mark 4 air from the time it was new, dealer installed..
About twenty years ago I restored the truck, removing the AC, and sold the truck to my nephew. He still has the truck, it has over 500,k on it... I think I still have the AC in box on the shelf..