1976 plymouth feather duster

First of all, NADA is about useless for value on cars like this, which you recognize. There are so many variables for the value of a car. Not just what it is, and it's condition, but what has been done to it. The color, other effects, modifications, you name it. Your car has a lot of those things that are going to be very particular to the buyer. Custom is usually harder to sell unless it's something most universally happen to like. To everyone else, it's going to be a foundation for a project re-doing it all, and they will value it that way.

Again, not making any comment about the value. What you ask, the response you get, and what people are willing to give it to you when they see it in person will tell you that. No one else should need to.

Personally, a Feather Duster is one of those cars I'd love to have. (I'd want it to look 100% stock though). I'd rather have a Hang 10 Dart Sport, but then beggars can't be choosers!