I would seriously doubt that Firechicken is stock. Most of them that year aren't. They were just too easy to mod. With just an exhaust system and gears, they would fly. Most guys went exhaust, cam, gears, and tune...with some even going with new heads. I have an 04 Cobra that's stock except for exhaust and runs 12.90's. Some of those LS1's will hand me my ass...along with an occasional SRT4 and other rice. There are some seriously fast cars out there anymore. It seems that if you can't run 10's, you don't have much anymore.
If you want to be quick, (no pun intended Quik!) go with the juice. No bigger bang for the buck for that occasional time you need to use it. Just be a little conservative, and have it tuned by a reputable shop that can keep your a/f ratio under control. It will be plenty safe.