Carroll Shelby’s original pitch was simple: take a British roadster nobody in America had heard of, drop in a big V8, and build something that could embarrass cars costing three times as much. Ford said yes after Chevrolet turned him down, unwilling to create a rival for the Corvette. Only 126 Mark I Cobras were ever built, split almost evenly between two different V8s. Here’s the story behind the bloodline that started it all.