Well i/h/e GSRs pushing around 155-160 to the wheels tend to run in the high 14-second range. With the extra oomph from the cams and such coming on mainly in the upper portion of the RPMs I'd say you'd be in the mid-low 14's.
Even if you stick with the stage 1's it would be a good idea to get a header with a 2.5" collector, a 2.5" hi-flow cat and a 2.5" exhaust; and also something to tune the car with along the lines of a V-AFC or something.