Stock clutch will hold at your power level until you do the tiniest thing wrong, one bad burnout without enough water, slow slipping at high rpm and then it is toast and will not hold any rpm.
I'm still on the original clutch after more than 25,000 miles going to the track a couple times a month over the last three years. It still holds great with ET Streets. However, I don't slip the clutch and I think it's a bad idea to do so with a heavy car and high torque. Just get the clutch out fast and let it clamp. Vary the pressure in the tires to determine how hard you want the E/T Streets to hook.