1966 Dart + later model 3 spd stick?

I am eyeing a 1966 Dodge Dart 4 door sedan (have yet to see the car in person) that needs a clutch.

Apparently; it is a 225 Slant Six/3 spd car and since the older Mopars had those nasty non synchro low gears------------would a 'box from a 1970's Aspen/Volare be plug n' play? I know the clutch disc is the same as well as the tailshaft mount/speedo cable drive but am concerned about the bellhousing/transmission interface as well as linkage issues (if any).

I have a lead on an all synchro 'box locally and the wrecking yard claims it will fit. Just making sure here.