The obvious are well, obvious...
coil on firewall not engine
oil filler/breather wrong color
oil filter wrong color
wrong air cleaner
wrong voltage regulator
no horn
harness wires are not correct (modern PVC, no cloth braiding)
carb
Some things that are a bit more interesting:
The mount for the remove hydrovac breather is installed, but no breather or pipe... brake system red flag!
Radiator cap is wrong
A coil filter is installed, but no other filters are. Since the side panels have the mesh, there should be a full suite of genny/regulator filters.
If the body is any indication of the truck, its a late 42 / mid 43 truck.