jasons

apparently the standard clucth is good for 200bhp, same as fitted to the 200bhp modern alfas (according to our local alfa dealer), but it is the torque that kills them.
Mine runs 313lb/ft and the torque is there ealier and for longer, the standrad replacement clutch does not noticably slip.

Beware of merely uprated springs, if you can get something a little better.
standard clutch is around 110quid, proper uprated nearly double.
if you intend to keep it a life time, I would uprate it, if not, just go standard.