This isn't a GT40 coupe—it's the roadster variant that Ford shelved, now surfacing on eBay as one of the program's rarest offshoots. The mid-engine, aluminum-chassis prototype represents a fork in the road the factory never took, complete with the original 427 big-block architecture that powered Le Mans dominance. Prices for documented GT40s have crossed into seven figures; this one's provenance will determine whether it's a steal or a cautionary tale about prototype tax.