I hate to preface this with THIS but if price is not an object, the Borgeson steering box is an excellent choice. This site has a sponsor known as Bergman Auto Craft that sells a kit that makes it all a bolt in deal. It is about $900+ including shipping, or it was a couple of years ago. Inflation has hit everything.
The Borgeson unit will feel much more like a modern car than any other option.
A far off, distant option is a quality rebuild from Firm Feel or Steer and Gear. Nothing that you buy at a parts store or Classic industries can compete with an original steering box that is properly rebuilt. Keep in mind that the slop that the factory steering boxes have at the center of the travel will still be there in any OEM steering box. You can adjust some of it out but it will always be there and increase as time and miles March on.
Good luck…
The wife and I considered a move to Kingman last year. We places an offer on a place on Bull Mountain but got overbid.