Cam, stall, tune, injectors, fuel pump, tune...
I would go with a TSP 220/220 on a 112
A Circle D 3k stall
8.1l injectors
Wahlbro pump
Find a good tuner
Even if you install all this yourself and find good deals I doubt you will be under $1500. You might get away with the cam without the injectors or pump but you better have that in the budget BEFORE you install the cam. The stall will be $375 shipped to your door and worth every penny!
2005 Silverado SS AWD
AEM CAI, ARH LTs, HD-2 shift kit with vette servo, Circle D 278mm 3200 stall Madtunesracing.com street tune (MTR now has a Dynojet 248 chassis dyno)
13.82 @ 94.92 w/1.83 60'