Dan,?
Did the original motor still work only needing new bearings?? If so, can the bearings be replaced?? I've never seen the stock motor from a 50s Willys but you might be able to machine new bearings out of sintered bronze or Delrin.? This could make yet another project to drive you crazy... after all it is mid winter and still officially COVID times (12th wave now?)
Cheers, Pavel up North.