Originally Posted by
sced
I'd go for the CT crank and try it with your current setup. A Veloce BB is a cheap addition if it turns out you need it. I did this with my wife's 86 Bianchi that's running late 80's friction Athena FD and Chorus RD and it works great.
I would not try a Campy crank with a potentially non-compatible square-taper. If the taper is too narrow, the crank arms will seat (if they seat!) too close to the bike centerline, messing up the chainline. If the taper is too wide, the crank arms will seat too far from the centerline, messing up the chainline in the opposite direction. If the square end is about the same size as Campy but the wrong taper, the stress pattern inside the Campy crank arms will not be as intended when its torqued. I can't say what problem would manifest itself due to that improper pattern, but I could imagine crack formation and eventual fracture of the crank arm.
If a correct BB is available for up to say $40, I'd go for it. You'd spend at least another $40 rectifying the results of a fractured crank, and have down time. It may be a low-probablility problem or not, but I dont' like looking over my shoulder at things like that.