with the then-new Corvette Sting Ray Z06, which was also making its racing debut. Cobras dominated the SCCA United States Road Racing Championship in 1963, but the car was less successful in the FIA World Sportscar Championship. The Cobra's open-top body simply wasn't aerodynamic enough to allow the car to reach the higher top speeds its hardtop coupe competitors were capable of, particularly the Ferrari 250 GTO. For the 1964 season Shelby had Pete Brock design a new aerodynamic body for the Cobra chassis, which would make the car capable of speeds over 190 mph. The new car became known as the "Daytona", named for its inaugural race at the Daytona International Speedway. Only one Daytona coupe was completed at Shelby American; the other five cars prepared for the 1964 World Sportscar Championship had their bodywork completed at Carrozzeria Gransport in Modena, Italy. Driven by Dan Gurney and Bob Bondurant, the Shelby American Daytona finished first in the GT classes and fourth overall at the 1964 24 Hours of Le Mans, bested only by the prototype Ferrari 275 P and 330 P. The Ford Motor Company's new prototype, the GT40, fared poorly; none of the three cars entered into the race finished. After the end of the Bahamas Speed Week in December—marking the end of the 1964 season—Ford handed control of the GT40 program to Shelby American from Carroll Shelby's old associate John Wyer (who ran the Aston Martin racing program when Shelby won Le Mans in 1959). Under Shelby's management the GT40 driven by Lloyd Ruby and Ken Miles won the first race of the 1965 season at Daytona, and Miles and Bruce McLaren finished first in the prototype class and second overall at the next race at Sebring, but otherwise the GT40 program was a disappointment overall, once again failing to finish at Le Mans. By contrast the Shelby Daytona coupe had great success for Shelby, winning the GT Division III class on the strength of class wins at Daytona, Sebring, Monza and the Nürburgring. With the Shelby Daytona, Shelby became the first American constructor to win a title on the international scene in the FIA International Championship for GT Manufacturers in the 1965 season. Shelby American worked with Ford to re-engineer the GT40 for the '66 season, replacing the 289 cubic inch (4.7 L) engine with Ford's larger, more powerful 427 cu. in. (7.0 L) engine. The