67-69 barracuda 4 speed parts fit 70-72 dart/valiant?
Do it.
Vin on the trans case tells a story.
For what it's worth, I'm building a transmission out of parts from about six different vehicles.
Case from a b body, gear set and input from a late model truck, F body main shaft, Shifter from a B body, shift mount and tailshaft from an A body and a bellhousing from an E body, pedals and floor from a late A body.
Most of this stuff is the same.