There are several people that have done this in one fashion or another and wrote about it. FM has the basic instructions. The one thing FM doesn't do, that I will be doing is having my input shaft welded.
The way a few folks have described is a more direct response. The input shaft has a spring and a little give to work with the power steering. When depowering and looking for instant turn in, you weld the shaft. Otherwise, as I understand, you will have a small amount of play and or delay.
I'm still waiting on my spare rack to begin this work or I would have better information.