F54XA on the engine serial number indicates 3600 (3/4 ton), which has the wheelbase you describe and the 8-lug wheels.
The engine serial number was often used on titles & registrations.
Is there an ID plate on the cab, between the driver door hinges? If yes, post the code (this code was sometimes used on titles & registrations).
3836848 is the head casting code for 1956 and later 235 heads.
D248 on the block is most likely a block date casting code:
D = April
24 = 24th
8 = 1958
Here are locations for a variety of codes. Post what you find. 
