As Tj suggested, the 37 & up box is a big improvement. You get a 17 to one ratio, as opposed to 15 to one, and a rolling sector to reduce the drag, or friction. All ford parts, and a bolt in with Drakes mount kit, or modify you mount. Lots of previous threads here if you look.
The '37 is an actual drop in as the locking collar is in same location.You will need to replace the frame bracket also.Make sure you get the 37-39 light switch bracket also.The 35 will not work.
I’m turning 74 & anything I can do to make her easier to drive ( strength & drivability) that’s obviously what this thread’s about! I Think I originLy had a post / thread on power steering when some of the guys said the ‘37-‘40 steering box conversion improved steering a lot!