ive used centerforce clutches with great success for the last 4 years in my car, i had a dual friction on my previous motor that held 440 RWTQ with no problems, and now im using a DFX clutch that grabs like a mofo, but its a little harsh, i woulndt want to drive it everyday.
You cant go wrong with centerforce, SPEC of mcleod, they all make great products. I had a RAM powergrip on the car when i bought it and i hated that thing. Dont skimp out when it comes to the little things like the clutch quadrant, the cable, clutch fork and obviously the throwout bearing and the imput shaft bearing. Personally anytime ive had clutch issues it has been because of the cables, i dont know if it is just me but i had alot of issuse with cables stretching and then they would bind up in the sleeve which made the clutch feel very hard and it generally just sucked. I use a steeda cable now, and they seem to last the longest