Info wanted regarding factory Firm Feel steering boxes

In a big parts purchase I ended up with a brand new power steering box - Chrysler part # 3643334. From internet research this seems to be a factory Firm Feel box for police cars and some big block or hemi E and B body cars. Can anyone confirm that? I would like to use the box on the 1970 Dart GT that I'm currently putting together.

2 questions :
What could go wrong with a new power steering box that has never been used and has been stored inside all this time (the steering box was shipped by Chrysler to a dealership in Gresham OR in 1993)?

Some of the internet chatter about this box indicated that it needs a different pitman arm and a different presssure hose to be used in an A-body - can anyone confirm that or tell me what pitman arm and hose would be appropriate?