Torque limitation

You've covered mbt but what if you wanted to tune more bhp but limit the amount of torque produced? What I mean by this is I have a gm 2.8 v6 turbo engine and with the modifications I've done it's capable of over 400bhp comfortably, however the f40 manual gearbox and clutch would struggle because mbt with the engine producing 400bhp would result in around 520 lbs foot torque. How would I tune to get the most bhp whilst limiting torque?