Some things are different on big bolts than little bolts.
Late '49 is when they started putting series numbers on the trucks hood for the little ones, anyway.
You'd have to cop the numbers off the side of the motor to know for sure what it is.
In '47 windlace around door opening is held in place with screw-on metal retainer. Headliner center bow is screwed to roof of cab.
In '48 Windlace around door is black rubber and secured with metal strips screwed in place. Headliner center bow screwed in place.
It was my understanding that the parking brake on all the big trucks was next to the shifter.. but I could be wrong.