what kind of 1/4 would you expect from a reg cab short bed 5.3, with ATI supercharger runnin 9lbs on a d1sc with bout 415-420 at the wheels... i know there are other factors but im just lookin for a rough estimate

 

Go into the fastest truck list and see if anyone has your setup and see what thye are running.

 

This is a good way to estimate http://www.speedprogroup.com/calc.html

use about 4200lbs plus your weight

 

I would guess about a 12.3 to 12.5 at 108 to 110. Should be in that range depending on like you said a lot of other factors-weight, torque, traction etc.