Alfa-Romeo T33/6/12. The story goes that this car was testing at Sebring to try and tackle the Ferrari 512s and Porsche 917s. The project was cancelled after (rumor has it) some teens stole the car and took it’s motor. Apparently there is also a story about an unknown V-12 hot rod beating all comers in the Sebring area shortly thereafter. Interesting… (via Sports Car Digest)