Ford gave the Mustang II one final send-off in 1978, borrowing styling straight from its biggest rival to create the rarest trim of the whole generation. The King Cobra combined Trans Am-inspired graphics with a genuine 302 V8, a factory air dam unique to the model, and a fully-equipped price that pushed past $6,000. Read on to find out how one six-Mustang-II collector still had to go hunting for the one trim missing from his garage.