IMHO, Bullitt is and always will be the best chase scene. I was in high school at the time the movie came out. The favorite discusion at the time always turned to the cars in the movie. The Mustang was a '68 with a 390, as snakebitekit said, and the Charger was a '68 also, with a 440 in it. Great car chase! I watched it too, on the weekend.
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"The 427 Cobra is easily the highest performance car ever sold for street use. A decent 427 - not the worst, not the best, will go from zero to 100 mph and back down again to zero in less than 14 seconds. All thing considered, you can put together a pretty good argument that the 427 Cobra is the ultimate performance car, judged on any basis you want to name." Taken from; Corvette, The Sensuous American
