With a bit of experience on a 1/4mi road course, a 2 disc 6 spring will be just fine for your class. Guestimating a typical track layout for 1/4mi left AND right turn - a 14-62 should put you in a good range for gearing. If they were still readily available new with replacement parts handy, I would've recommended a Ward Viper blueprinted and setup by MartinBuilt. Something to think on though, a "Snapper" clutch (one where the initial engagement is quick and hard that it "snaps" you forward) does NOT always equal a quality clutch or quality rebuild, it's the consistant even engagement across the entire plate surfaces that counts, especially on road course where there is an on / off / on the gas (having to back off the gas going into a tight right hander for instance, where the clutch will stall and then re-engage possibly) The Vortex is a very smooth engaging clutch, yet it has won many many road course races (WKA nationals and local alike)/street races.