I saw a 69 AMX 36k miles on it, NEVER registered (the dad who owned a AMC dealership bought it for his son in 69 and he had been driving it ever since with the dealer plates on it)leather A/C etc..on fleabay awhile back. Last bid I saw was 21K, and it still hadden't met res. I was drooooling over that one big time!! (wish a wasn't so damn poor!!)
BTW Did you know if you take the later model (dog leg port) heads and bolt them on your 68 AMX you can get another 15 -20 HP out of it?
I did that to my Javelin after I "wore out" the 290 it came with and dropped in a 390!
But all in all the 290 was a MUCH better engine. Not as much top end, but stoplight to stoplight I never got beat! It was like the chev. 302 SHORT stroke and QUICK in the 1/4 mile.