Engine is an old rotary pump design. It is the original engine, (rebuilt a few times) that came in the truck in 1987 or 1988. The year is approximate, It was one of a few trucks we picked up to salvage for the engine, but it was in too nice of shape to scrap once we looked it over better.
I will check with him for sure next time I see him about the brake model. I am almost certain it was a pac brake.