A buddy of mine had this painted on his '74 Duster (non-original - of course). It was a '74 Space Duster, originally with a 318 (I think), automatic in white. My buddy had it painted HOK Purple and threw a 440 with a tunnel ram intake. My buddy sold it about 5 months ago or so in the Fort Knox, KY area. Not sure where the car is now... Just thought it MAY be the same car and the seller is passing it off as a Marvin the Martian, Looney Tunes Edition (if they even exist). If the car you're talking about is the one on CraigsList in Colorado - ignore this post...
Sean