I did a power steering kit on the 59 from Chevy Duty years ago and the kit that you describe sounds different then the one that I bought awhile back. The one that I bought mounted very easy. I used a steering box off of a late 70 chev truck and a pitman arm off a 70-72 Malibu. The kit works great but I did have issues with bump steer after installing. To fix the problem I flipped the tie rod on the drag link to make it more level and that fixed the bump steer issue.
