Look back on these 53 factory SS/AMX's. The link is for #42 as I thought it showed an interesting history; D7 Champion, for sale in ND or similar for $2,495 then sitting on a used car lot, found in a barn and now resored. The last few that have sold have been in the $150K range.
At the bottom of the page you'll see the link to the other cars. Interesting history of a very unique car!
http://www.ssamx.com/42.htm