Difference between 70-71-72 dusters...

So here is my question for the group, especially TA who started me down this rabbit hole...... I have a 70 intact Duster with a 198 /6 3 on the tree numbers matching, conventional dash with knob radio, that I had planned to clone to a 340 with 71 stripes (my high school car). Now TA has almost 100% convinced me that I should just restore as is. Thoughts???
Cheers
Tim