Depends on the style of blower....... I would think that 4.10s would be excellent with a centri.... but with the additional lowend torque of a roots or twinscrew 4.10s would probably be too steep. Unless you run drag radials on the street.

 

I noticed some of you were asking about what rpm you'd be running at a given speed with a particular ratio. Go to this website and click on the "Gear and transmission calculator" then select the "Street performance Calculator". Then just plug in your rear axle ratio, tire size and road speed and you will know.
http://www.richmondgear.com/

 

What do you think then Tom... 3.73's ..

 

3.73s seem like they would be a good compromise. You may want to ask someone that has a twinscrew with the same trans that you have and see what they think.