Nice Truck!
I purchased one of those (1/2 ton 4x4) brand new back in '79 when I was working at a GMC dealer. It was actually the same color as the dark blue on your truck.
Purchase price was around $7,800. Am sure there are wheel and tire combinations on new trucks that probably cost more than that today.
BTW, those mirrors, IMHO, are some of the best that GM ever offered on a LD truck. Their vertical orientation allows for a much fuller field of view than the horizontal ones that replaced them.
Good luck with your project!
Best Regards...
