I have a 2000 Z-71 5.3, I have cold air, elec fan, nelson tune. Im in the process of adding Texas Speed Stage 2 heads, 80mil Throttle body, 45lbs injectors, 224 cam, Long tubes, Fully built trans with a 2500 stall. I already have 4.10 gears and a tru-track. What kind of power should I get from all this? I know Ill need a retune. Has any1 done something similar to this? Is 400 WHP possible? And also What am I missing? any sugestions?