went to the dyno
First off, BEAUTIFUL car! I would DEFINITELY do a cam change instead of N2O. Your engine already makes over 200 ft#s of torque more than your HP, which tells me your cam is WAY too small....unless you meant to build a truck motor.
The N2O will add a lot more torque than HP (and you already have a boat load of torque). I don't recall the exact numbers, but something like a 150 shot will give you an extra ~250ft lbs of torque.
I'm not trying to step on your toes, I would just hate to see such AWESOME potential go down the drain.
Dave