Do you have a standard GT or a Saleen?
If you have a Saleen, which model do you have?
A standard 2000 GT puts out around 260hp at the crank, take out about 15% drivetrain loss, and you're looking at around 220-230 hp at the rear wheels.
All auto makers take their hp numbers from the crank, not at the wheels.
Stock vs. stock, an LS1 usually tends to run .3 to .4 seconds faster in the quarter mile than a base GT
A stock Saleen S281 puts out 285 at the crank and expect about 245-250 at the wheels.
With the weight difference, you should run about even with a stock LS1...
------------------
"The Yellowjacket"
1998 Mustang GT
13.97@103
"Hey, you weren't supposed to be that fast!"- Turbo Eclipse Driver