It's been 1200 miles and not one problem with Southbend's clutch/flywheel/pressure plate combo. I'm using a stock CSC with a bearing cover that works perfectly with the Southbend's offering.
370Z VHR South Bend DXD Clutch Kits for stock CSC
I'm using a Stage 4 clutch with the billet flywheel and it's performance has been flawless. I believe RCZ is also using this clutch/pressure plate combo with a lightened flywheel and has great success with a SC.
Unfortunately, Joe is not a vendor on here and not many people realize that 370Z owners have this option. He has also developed a all metal CSC that is in testing mode and should be available sometime next year.
Tell him where you heard it from and you may get a discount