Will only share personal experience re:clutch, my profile is similar to yours in terms of potential HP and torque. I put out 440 RWHP and 485 ft./lbs. of torque. I have a JWT high performance pressure plate with the stock type organic disk. I drag race the car and have been known to engage in an occassional speed contest. I've gotten 60,000 miles out of their clutch, and it has a very stock feel in terms of pedal pressure and mode of engagement. Good luck in your choice, Mark