by Brad King COBRA Take a 4.2 litre American Ford engine and install it in an English AC Ace chassis. Result: one of the most potent sports cars ever created, the brainchild of American driver Carroll Shelby. He began producing and racing it in 1962. Later the power was upped considerably. There were Cobras with 4.7 litre engines giving 350 b.h.p. at 7,000 r.p.m. and 6.9 litre engines giving a massive 490 b.h.p. In Europe a Cobra won the GT category at Le Mans in 1964, while the Sports Car...