Difference between 70-71-72 dusters...

Rainy Day Auto said
70 is the hard year to find

I have found a ton of 72's and few 71s but never a good 70 that I didn't have to bring back from the dead.

Very true. 70 and 76 are probably the 2 years I’ve seen the least. 72s are hard to find around here, but Duster’s in general are hard to find around here