HotRoddin,
Man don't ask me how it just does it. I'm an old car (Mopar) buff too. Hemi Cuda's can crank a lot quicker than 13.40s on slicks I've seen automatic cars go 12.40s. I've got a friend with another GT that was lightnened and he ran it without a belt and iced the intake and went 12.90s stock. Something you have to look at too is like somebody with a REAL hemi cuda that is stock restored it's worth what around $100,000 if not more? They're not gonna flog the heck out of that car at the track like somebody with a mustang that you can find them easilly.
I know several people who are running this kind of time, the only thing I can tell you is it's all in the launch. Most people go and run there cars and they just kind of take off and spin and everything. I once read somewhere on the internet on a website for "How to make your stock mustang run 12s" I can't remember what that site was, the dude said "If you're afraid to launch your car from 4000, leave it at home"
That's the only thing I can say, it's works.

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90 Mustang, full weight, 5 speed, pulleys, 3.73 gears...
13.33@101 mph on stock motor and DOT's
12.44@112.5 on the juice.
Check out our clubs website at
http://www.stanggang.com