The Q45 front brakes generate more torque than the 300zx fronts but to me that just says its making an already overly front biased set up even worse. Just throwing the biggest brakes you can find on the front of your car is not going to make it stop any better.
If your only going autocrossing I think you're better off with stock brakes, good pads and good fluid. You are not going to overheat your brakes on an autocross course. Remove the stock proportioning valve and get an adjustable one to dial in the brake bias how you want it (I don't know if that would be legal for your class).
An adjustable proportioning valve is probably ~$40.
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