do yourself a favor and spring for a scattershield before you go SFI on the clutch...imo, the two most important things for safety are your flywheel and your bellhousing...dont race without a scattershield is all im gonn say
as far as flywheels go, they dont have to be sfi, but would be nice. I personally use a flywheel from 440source.com that is billet steel...its not aluminum and its not sfi approved, but the price was right at 99 bucks, and with it being billet steel instead of nodular or cast iron, im more than comfortable having it inside my blowproof