If you want to argue about stops in the box, call Chip at: http://www.powersteering.com/ He will talk to you all day about power steering boxes even if you have no intention of buying anything from him. His whole life is GM power steering boxes. I don't recall the details, but somehow the box stops work in conjunction with the steering arm stops.

Here are some other good resources in descending order of usefulness to learn about power steering:

http://jimshea.corvettefaq.com/?page_id=5

http://www.chevelles.com/techref/ftecref29.html

http://www.442.com/oldsfaq/ofstr.htm

http://www.67camaro.net/tech/steering.htm

I don't claim to be an expert, but I don't jump in on topics unless I believe I know something about them or have direct experience. As I said, from I've READ, the box stops are important and the Jeep Grand Cherokee, '93-98 or 99 is virtually a direct bolt in swap and is a better match than the 3rd gen f-body and much easier to get than the mid '80s Monte SS or GN boxes.