Actually, stock muscle cars probably wouldn't have much of a chance against many of today's mediocre sports cars on the track. I'm saying that out of ignorance, because I'm not a racer, but it only seems logical to me given the fact that cars are lighter, chassis set-ups are much more advanced, and tires (I'm sure a big component) are much more aggressive than those bias-ply slippery tires they had in the 1960s.