You better be ready for a race.
You car should have 10 second potential if tuned and driven properly but it doesn't take too much to get the Shelbys to run real quick and still be driven everyday.
I tangled with a modified one last summer on the street in my high 11 second 440 Sixpack 4 speed Challenger....he had me by a full car the entire race.
http://www.youtube.com/watch?v=oN-7wf0mmsI