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
He convinced me to leave mine as it is.

I have a 71 duster slant car, and I was going to clone it to a 340 car with 70 stripes and a 70 color.

But now after thinking bout it, i am leaving it pure 71 and a slant