my uncle in Wyoming has a dual headed caddy. his dad and uncle made it in the late 70s i believe. it is 2 59 cadillacs.one has the engine, the fuel cellis under the other hood. the steering wasnt linked into each other though so it took 2 drivers as well lol. anybody out near Rawlins, Wy might have seen it. it sits out in front of one of the Perkins Conoco stations. its pretty cool