73 Duster petty blue

The original owner sold it years ago and then found it again a few years ago but it was completely stripped. It is a roller, meaning no interior, no engine and trans. The body of it is in great shape. I am trying to decide what to do with it,cause I have a running and driving 75 dart (318 auto car), that I am thinking of dropping in the duster. Then the duster will need paint and interior. I do bodywork and paint, so that is not a big deal. I guess my question is, is the car going to be worth doing, or should I just part both out and call it a day? I have $1500 into the pair of a-bodies, and the only way I will swap the parts and spend the time to paint the car and replace the interior, is if I can get around $7500 for the duster when it is done. Whatcha think?