Consider a serious race setup for a turbo car...3.27's and a 1.85 powerglide. At a certain power level with a hard hooking car, you can only put down limited power with a set tire. At that point first gear ratio loses importance. I suggest gearing the car one time instead of the multiple times some do. 3.08 or maximum 3.27 is all you will be able to use. IMO.
Yea I'm hoping to pic the right gear first time. lol I'm leaning 3.15 right now