[32phil]

I can't stress enough the need to follow the instructions in the Service Bulletin...
100% to the letter..... in the exact order and method described in the bulletin.
In my experience, if done properly, the result will be a steering box that works remarkably well.
Over the years I have found several pitman arms that have had the blocking grooves filed to eliminate them. A few were done so well it's difficult to see where they were filed unless you compare them to an unmodified one. This allows placement of the arm in any position. I have used them on modified cars and it allows centering of the steering wheel. Usually... no more than a tooth or two off from what would have been the original "mandatory" placement of the arm is all you need to dial in stuff (drag link etc.).