Early '67s didn't have the rag joint either. My '67 has a 1-piece shaft. When I upgraded from manual to power steering (and quicker ratio steering box), I had to remove the steering box and shaft as 1 piece. The motor has to be up and out of the way to do this. Some people will tell you if you jack up the motor, remove the oil pan, and hold your tounge juuuuust right, you'll be able to slide the thing out. I took the motor out of the car. After that, the steering box/shaft removal was quite easy. It also gave me the opportunity to paint the engine bay and clean up the motor.
1. Remove the steering wheel.
2. Unbolt the column from the dash.
3. Unbolt the ball joint from the pitman arm.
4. Unbolt the steering box from the frame.
5. Slide the steering box/shaft down and out towards the center of the engine compartment.
Another hint: disconnect the wires that are coming out of the steering column. Moving the column around could pull on these wires and rip them apart.