Gear ratio

[IndyNova]

Getting ready to order my rear end, and need some help picking a gear out. It'll be a 12 bolt moser rear end. It's going in a 69 nova, 18x8.5 wheels, 6.0 turbo ls motor. 95% will be street driven including long trips, and the other 5 will be auto X and/or road course. Any other info needed, please let me know as this is fairly new to me. Thanks