Thanks for the link Dave.......I've just done alot of reading.
Ben, thanks for your imput too.
The thing to consider though with clutches is that building a clutch that will handle 800+ hp is easy....larger diameter driven plate with steel faces and heavier diaphram....problem is, it's not very streetable, ie. heavy pedal, shuddering and in/out feeling which is bad for the driveline.
What I like about the Boss Drive setups like the Nismo, ATS and the new Exedy 'D' Twins is excellent grip without ridiculous amounts of clamping pressure and the Boss setup is very driveline friendly.
Jim Berry sounds like a top bloke that knows his stuff but with all that I just read, I didn't find anything on compound mixes etc. He also lightens cast flywheels and with 4000lbs clamping pressure, which is what I read, you're asking for an amputation. I prefer the Jap steel lightened flywheels after seeing an old customer of mine that used to work at Super Roos in Edwardstown (when Super Chev were still around) lose a chunk off his tibia, snapped his left lower leg at right angles and a piece hit him in the left shoulder!!