You are going to be a lot closer to running with an automatic 5.7 chally than you think or than anyone here seems to think. I was able to hang pretty close to one with my old '04 3.9 V6 Mustang that only had a tune and CAI and true duals on it.
You may not have as much top end as he has but in a 1/4 mile drag race(at the track, right?) you should be pretty close. I say just get a 93 Hybrid tune from bama and you will at the very least be right on the challenger.