I would think it should hold within reason, I'm running the same clutch and a 38r now and I plan on a set of 250 hybrids soon and plan on it holding. From what i've seen 500hp is bout all you're going to get out of 238's and a 38r and that is if everything else is working flawlessly so 450 to 475hp I would think would be normal so i would expect it to hold.