Here's my '64:
Front: 1979 C10 front suspension, 3" drop spindles, 1 coil removed, 2" chassis Z, wheelbase moved forward 1" to center the wheels in the front fenders, lower control arms moved 3/4" forward to gain caster. Front wheels 15x6, tires, 215/60-15. Total drop: 7
Rear: 1979 C10 12-bolt narrowed 3 inches total, 5" drop coil, 2" block, ECE Super Track Bar, shocks relocated, forward trailing arm brackets flipped, frame is C-notched. Wheels 15x8.5, tires 265/70-15. Total drop: 7
