Oneway71 had a 73' Duster with /6 and 3 speed with about 40k on it that he was selling for around $3000, but nobody wanted it. I would've, but was broke at the time and couldn't get any of my family interested enough to buy it. I think he decided to keep it. He's located in Ionia, which would be a bit of a drive for you, but you could always see if he's still interested in getting rid of it.
http://www.forabodiesonly.com/mopar/showthread.php?t=150928&highlight=duster+ionia
