From what I gathered from my AMX/Javelin SST neighbor, the AMX could have had a Mark Donohue rear spoiler on it, but it's more of a sculpted spoiler and doesn't stick up like that one does. I'd say for how clean it is the car should be around $18-20,000.00, but JS27N0B's brother's figures may need to be put into perspective as he's an AMX guy who sounds like he knows his stuff. Still a cool little car as I've seen and been in several before and they're pretty fun. ('68 all-original 290-4 speed AMX, '69 SST Javelin with a 343 as well as one with a 390.) One great idea that comes to my mind is check into the AMC national club...I've met the club president from the Wisconsin area and I'm sure they'd be able to help you out with your decision. (this guy has an S/C Rambler as well as a prototype AMX that was a frankenstein car...had the rear end of an AMX with a Mark Donohue spoiler, yet had fenders that were eventually used in the newer Javelins with the bulged fenders.)