If you are feeling a little low about your HP numbers maybe you need to get one of these.
At 342 rwhp and 310ft/lbs. Big Gulp is a torque monster. The run was stopped at 7k, but as you can see it is just starting to peak. How much power do you think it will make at it's current redline of 8700 RPM's ?
Using a M62 supercharger. Now that will get you across Forest Lane at 5 o'clock traffic!
http://biggulp.home.att.net/dyno.htm