I like truck #1. Those air brakes, will have you way ahead in the game, as far as being cheaper, to maintain, and easier to work on. The cast spoke wheels, give you the option of running 22.5 tubeless radials on it. I've owned several 60-66 "C series, and "L" series trucks. The blue, and white wrecker, and the white tractor, were both 80 series, full air brake trucks.
Spanky Hardy Collector Of Fine Old G.M. COE Trucks & Antique Holmes Wreckers