Cam help
If you want supporting mods It depends on budget. Unlimited Budget: Get AFR 205 heads, Fast 90mm Intake w/Nick Williams 90mm TB, pulley, QTP headers w/high velocity merge collectors, sweet thunder true duals (or whatever sound you like)
If you are on a budget: PRC stg 2.5 5.3L heads, LS6 Intake w/ported TB, pulley, Pacesetter headers (best of with QTP or KOOK's thouhg), sweet thunder true duals (or whatever sound you like)
As with anything else get suspension and drivetrain upgrades to put the power to the ground. This is just for the engine.

