My 59 Apache had some serious steering challenges when I was restoring it. My solution was to replace most of the front end parts. The new king pins made a huge difference in steerabilty, and may have been THE problem. After that chore was completed it steered and handled like new.
I considered going to a power box as well, but after getting it all back together it really didn't need it.
If you do change over, let us know how it works out. Good luck.
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Jim
Apache Hauler