I just switched from 3.55s to 4.11s. Though this isn't what your switch is, I can tell you the difference is HUGE. I've also run 4.56s before. My dad's Camaro had a TH350 and 3.73s and it drove real nice. I think you'll see (and feel) a huge difference. Even a 3.55 would be good. Kind of a compromise. I really like the 3.55s in my Chevelle for the street.