Hi Ant, this is one reason we will fit the conversion to a standard car (with std clutch) to see how it copes. My guess is if the clutch is in good order and your not agressive on pullaway (which puts alot of heat in the clutch causing slip through the gears) if should be OK.
We had a stock clutch in our car with 'almost' GTT260 spec for a while.....it was fine, but as I say traffic light grand prixs are not recommended. If we find it needs the Exedy then we will fit it afterwards..