Well, I kind of hedged a little; I heard they all had the problem but, somewhere out there somebody doesn't and I would have been technically incorrect. I've considered getting a period-style header, as my car is a 100M, but it would have been as much to eliminate the annoying 'pedal knock' as for any HP improvement (I think driving these cars much over 3,500RPM is a risk anyway, as crank fractures are also a known problem). I've just gotten in the habit of not getting the last inch or so out of the clutch pedal; in fact, since the problem is endimic maybe a little spacer on the backside of the pedal might be a worthwhile bandaid*.
* Edit: I've read--in my Mustangs' owners manuals IIRC--something to the effect that 'the clutch pedal needs to go all the way down.' No explanation given but, obviously, if your clutch isn't fully disengaged you'll grind your gears and possibly damage something, but the clutch should be fully released before you floor the pedal (probably no more than, say 3/4 of travel at most). Anyone know the reason for this warning?