I have 3.00:1 behind my 460 and they work fine with my transmission. Combined with the 3.28:1 first gear ratio, I have a combined ratio of 9.84:1 and it will launch pretty well. With my tire size of 295/50R15 (overall diameter of 26.6"), I'm running 2,650 RPM @ 70 MPH.
Your choice of rear end ratio will depend upon the overall ratios - 1st gear as well as top gear. As this is primarily a street car, how much highway or freeway use do you expect?
The first thing is probably to determine exactly what you have in both rear end (count the teeth) as well as transmission. How tall are your rear tires going to be? What is the maximum RPM you expect to run? Once you have that information you can go to any one of many gear ratio calculators, plug in your ratios and see whether that will work for your intended usage. The one at
Calculators is pretty good, but there are plenty of other online calculators.