How to figure out what I have ?

[scikotic67]

I just traded for a 67 3/4 ton long bed gmc with a 327 i believe and a 4 speed on the floor. The truck has manual locking hubs and instructions on the dash from dana on how to lock them, my question is were can i look at to figure out what front and rear axle i have and what transfer case and gears i have. Any place I can see on the motor and trans to give me more info on tranny and motor in my truck and to make sure its original ? thanks