Early a drive shaft

The slip yoke style came along in 1966. Maybe look for a 1966 Valiant or Barracuda shaft....OR just measure and have one made.
I often part out cars and I save the longest drive shafts so I can have them cut down to fit my own projects.
Also...Having "The Burgh" as your location doesn't help your cause. Put in your actual location and maybe someone close could help.