The Fioroni Turbo Sliding clutch in black (OT-FR52) is a solid performing clutch. I used one in my buggy for years. I like the Twin Turbo black (OT-FR56) better, but that's my opinion. I have been using the Twin Turbo in my IGT car and after 2 full weekends of racing (4 day race weekends), and a bunch of street driving, the shoes are in great shape. The springs (yes they are the stiff ones) feel like they are tired, but the clutch still works great. No binding issues either.
Fioroni does make an adjustable clutch (OT-FR66), and if you don't mind the fine tuning aspect of it, it works great. For oval racing it might be overkill, but coming from on road racing and using Centax clutches, it's the closest thing to an on road clutch.