What gears with Spray..
The info dave would be helpful, but without that and assuming the basics (26" tire, street driven car) plan on 3.73s. If you have a 10-bolt still, plan on upgrading to a 12-bolt or 9-inch as part of the gear change.
Considering N20 significantly boosts trap speeds, 4.10 - 4.11 's would probably be overkill, It'd be a full time job shifting gears if your driving a stick. 
Very fun on the street though.
Not to mention, nitrous has little issues pulling high load, the increase in torque is phonomenal.
IMO Keep your 373's
How much taller a tire can you really fit under that body style?

Very fun on the street though.
Not to mention, nitrous has little issues pulling high load, the increase in torque is phonomenal.
IMO Keep your 373's
How much taller a tire can you really fit under that body style?

