Barracuda unibody year to year differences

Basically the same as far as Uni-structure from 67 to 73. 74 went with a different torsion-bar location(sideways across the front instead of running the length to the trans mount area). Very minor changes to the Uni-structure. Only differences in the floorpans is the auto vs. the standard shift. I think there is a couple of additional brackets under the floorpan for a bucket seat car. Thats about it!! Even the Dart and Duster are the same exept for the trunk extensions and outer wheelhouses.
you could drop the floorpan from a Dart/Duster and use it in a Barracuda. Drastic changers to the 70 up Barracuda noted as an E-body. That is a beast of it's own..