Which Clutch up to 450hp Street car with some drag racing?

Brewers recommends Mcleod MC75209 for small blocks up to 550hp for $411.42. They don't show an assembly for 350hp-450hp. I paid all of $200 for my clutch and diaphram pressure plate custom made for me by a local clutch retailer. My 414 stroker makes 511ft;lbs. I'm amazed how at it's held up. 3300 miles so far and I don't baby it. Absolutely no slippage what so ever! Yes the overcenter spring has been removed.