Its initials stood for King of the Road, and if the 1968 Shelby Cobra GT 500-KR looked like a more threatening muscle car than it really was, so be it. Shelby's 1967 GT 500 had led Ford's pony car across the 400-cid threshold with a 427-cid detuned race engine and a juiced 428-cid Police Interceptor V-8. Both returned for '68. Then in April '68, Ford unveiled an even-hotter version of the 428, the Cobra Jet, and offered it in the Mustang, among other models. The GT 500-KR's 428 had the same suspiciously low 335-bhp rating as other Cobra Jets, though some Shelby material put peak output at higher rpm. Shelby's version had diecast aluminum Cobra rocker covers but wore the same plain painted ram-air air cleaner.