I would definitely NOT recommend an Alcon clutch as well - only did 2k with mine and the plate is down to just above the rivets (as I have split the car). The engine was only pushing out c. 240bhp and perhaps slightly higher lb.ft figure as well! Not impressed!
As said a twin-plate is really the way to go for that kind of power - I know that Sunny has spent alot of time mucking about with it all, not sure whether he's still using a Stage 2+ Bernie BC box or not though!
Cheers,
Andy