Don, here is a reply I posted a while ago:
Chip is the MAN on power steering goodies. I sent him the box on my '70 and he fixed me right up. I had him "extreme detail" the box and convert to a 12:1 ratio. I also bought the new rag joint and pump from him. His work can back up at times, be patient.
The items arrived well packed and in excellent condition. The items function perfectly. The pump and steering box are outstanding, I really like the feel of the new box with the quick ratio, and no reduction of turning radius.
Here's the website:
http://www.powersteering.com/
One thing to note is that Chip doesn't replace your box with an F-Body box which kills your turning radius, he merely modifies your existing box with quick ratio guts. Mine has worked flawlessly and I like the feel, MUCH improved over stock.