I'm assuming that was a 760 and not a 740 if it had the independant rear suspension. I can say that this 393, on paper at least, you could argue 500 hp. But even being conservative lets say 400 h.p. I've done several launches with the car and have had no issues with wheels hitting wheel arches. Really tires are a good "fuse" so to speak, you can only put so much power to them before they spin. I'll bet, however, he will go through bushings on his IRS much faster than normal if its driven hard on a regular basis.