I found this one not far from the same year as yours and the same motor. I may have to call about it. I do love the AMX body of the 70s I think 71-74 are the same.
I also saw a 68 390 Go Package car as well in my search for Mopars and old Muscle cars. It needs body panels but the 73 looks nice.
Here is the add and a link-
I'm selling my 73 amx javelin, it has a 304 V-8 automatic. The car runs great and looks amazing. It has new upholstery, new vinly top, and new stripes. This car makes a great show car and weekend cruiser. I'm looking to get $7,500 obo also willing to trade as well
http://winchester.craigslist.org/cto/3365268120.html
I know we all wish it had a bigger motor but who says it can't be rodded out with a big block MOPAR motor!