Thanks. Does that imply a different distance between head tube and crown?? That would change how the bike stands.

Which brings me to the next question. How does one determine what stack height will be needed? I do not have the original. Most likely it would have been a Campy NR. I can see starting with a smaller height and adding washers if required, seein' as how they seem to be available. If I start with one spec'ed too large that may mean removing a washer, but perhaps there are none to remove so that headset won't do at all.