Pitman arm is hitting tortion bar! Help?

I had the same problem on my '73 Dart, tierod hitting/scraping the left T-bar.
I decided to shim the steering box about 1/8" - 1/4" with a selfmade wedge under the upper right bolt. Don't forget to loosen the steeringcolumn shaftbolts first, and to retighten them again after you've shimmed the steering box.