Powell
Well, I have to disagree with the Shimano stem. Its the fly in the ointment if youre going Campagnolo for the rest of the groupset. Youve even got Campag dropouts!
Doesn't match the seatpin either. It would certainly be nice on a Shimano equipped Koga Miyata or something but its just not cutting it slotted into a Campag headset.
Trade it in on feeBay for a nice Cinelli Record - same enclosed clamp - if your into that kind of thing.