changing gear ratio from 3.23 to ? Street & Strip Experiences?

If you are going racing a 3.91 would make a good set of gears and yes you will notice a heck of a difference between 3.23 and 3.91. Now here is the beauty of the 8.75 rear. Drive to the track, jack the rear up, swap the center sections, add fluid, go racing! When you are done for the day, repeat the process and drive the car home. If you do it that way, you'll get to the point of swapping gears in about 30-40 mins.