Up Your Shaft
Most any sixties or seventies manual box will do. Just get the manual steer Pitman arm for your particular car (F-body).
For the shaft, the way I did it, you'll need a chop saw, tape measure, a piece of metal tubing that will fit like a sleeve over the shaft, and a welder (man and machine).
Cut the shaft, use the tube as a sleeve to extend it the needed amount, weld it up and reistall it.
I'll try to wedge my camera into my Volare and post up a picture.