You know what I think.
Just watch spraying that much nitrous. It is a world of difference from an 80 shot. Use a few gallons of race gas, set the timing around 10 degrees, and to a couple short test blasts then check ALL the plugs immidiately.
If you go lean you can run very slow on a 175 shot. Not to mention melt your motor.
He has a low 11 car on slicks, but with drag radials probably low 12's or so.
Be careful.