1976 Feather Duster What is it worth????

With the exception of the hood, deck lid, and possibly the trans (if 4 speed OD), the rest of the parts are pretty garden variety type stuff. Aluminum 1 bbl intake is not that big to most people, bumper supports are something someone might look at if they were already messing with bumper, but most are not going to go out of their way to track down.

A complete lightweight car has more value complete then apart. Once the /6 gets pulled for a V8, the light weight nature of the car is gone, and the rest becomes a conversation piece. Side note, MOST of the lightweight cars were big bolt pattern disc brake cars. MOST were 4 speed OD cars.

Unfortunately, the parts from Dart Lite and Feather Dusters are not holy grail parts for weight loss. How heavy is a hood or deck lid, really? Is the aluminum substructure going to shave hundreds of pounds... nope.
The lightweight cars have their place...more for their place in history, their idea that Mopar could build a MPG car with old technology then their weight.