1976 Duster slant 6 in Georgia

supposedly a 1/4 of all 1976 Duster production had the $51 feather Duster package (about 5600 cars). So besides the aluminum parts was there a code on the fender tag?
Good luck with the sale!

Oh I see the code would be A31

And double looking at the pics I see some surface rust on the underhood bracing which would mean it's not aluminum and therefore not a feather duster.