early 60 series boxes have a square rectangular bolt pattern- later 60 - 80 series share the same offset bolt pattern... I recommend the later, more ubiquitous offset bolt pattern for more option availability if a replacement is needed.
there is a thread I located via search the other day using 60 series power steering. The thread is titled FJ60 power steering conversion, or something very close to that. the basics are:
1. add a pump somehow (bill dorey style valley hybrids brackets)
2. modify the drag link to accept a larger...
I kinda did this on my old wagon body. It *works. to do it well is alot of effort. That said, the liftgate hatch is very functional for helping to keep dryish while cooking on the tailgate
get a spare plastic gear. as stated above, if you use the steel gear, and have binding issues, the steel gear will transfer the problem, and possibly cause more damage.
A couple areas I keep forgetting are sore subjects to these pigs are their radiators, and windshields.
I don't have solutions...