I usually tried to launch mine at 2500ish RPM. You'll have to be smart with the throttle and the clutch to make it work. Here's and example:
http://m.youtube.com/watch?v=PVWFD2YdZNw
My RC had headers, exhaust, CAI, and sometimes tuning. I walked multiple SS Camaro's, a modded SRT8 Chally (6.1 car), and an SRT8 Jeep. I dId have mixed results with the 5.0's. Street racing is fun because it allows the slower vehicle a greater opportunity to win. Your truck should be ourunning most of the cars you mentioned from the time it hooks up in first, through second, and into third. Most of them will pull away from you in 4th. What year is your truck? Can you grab a gauge video of you launching it and video from the outside?