The AMC AMX also uses a Mopar 8 3/4″ rear end and other than that, its best ET is claimed to be a not-bad-at-all 11.3 seconds. Wait, that's not enough to get your interest? Well, we've got more goodies for you. powerplant connected to a 727 TorqueFlite automatic tranny. The model became a tubbed drag racer in the 80s and uses a 390 cu. To make matters clear from the start, we'll tell you this story is about a 1968 AMC AMX drag car that left its glory days behind and is now looking for a new owner via eBay.