And probably the BIGGEST variable in the outcome would be the DRIVERS of the two vehicles.
It doesn't matter how much power your car has if you don't know how to use it properly. This simply comes from practice / experience behind the wheel of your car.
If you go out with either one of the cars in question (Viper or Cobra) and simply dump the clutch and hope for the best, you're most likely going to lose.
Geto to know your car. -Practice makes perfect (plus it's FUN)!