[Karl Bebout]

A 3.73 would give lots of lowerend torque, but do you have the traction to handle it? What tranny with what ratios? What is your rear tire diameter? How often do you need the pull? If you're wanting it just every once in a while, a gentle shot of NOS might be your answer. The biggest thing about NOS is that you NEVER want to run lean on gasoline when using a spray!
A newer Z06 is plenty hard to get by. GM has done a darn good job wringing a ton of power out of a push rod motor, and you can still get well over 20MPG if you want to.