Measure the fork's steerer tube length (fork's race seat to top of tube) and the height of the head tube, subtracting the latter from the former. That's your stack height. Campy Record is about 40 or 42, if I remember correctly. Good quality headsets (Tange) are available down to 33 or so. Campy Pista headsets are lower than the Record, so that's always an option.