This is what I found on their website. (4×4labs Steering Shaft Kit for saginaw power steering conversions. $189). I will be doing a power steering conversion on my 40. Let me know what you will take for this.
The wear, on the engagement end of the gear, is the result not the cause of the problem. A thorough cleaning and lube will probably resolve the issue. Good luck.
It's hard to tell if those nuts are toplock or nylock, either way you need two to two and a half threads showing. If you are using Locktite you can use a regular nut. As mentioned above, a little heat and the locktite will cook off.
I would guess 71'ish with some odd mods. I would strongly recommend pulling all the non-landcruiser bling-bling adornments off as they are negative equity... I would say 4 -5K unless the soft top and doors are OEM and he still has the bows. It may be a good candidate for a rebuild, looks to...
Make sure you flush it to get ALL the metal pieces/parts out. Clean it as best you can, wire brush and where the rust is bad. While you have the access I would check the transfer as well. Do a fluid change in both and button it back up, I wouldn't think twice about it.