If you're gonna change the BB, maybe consider going much narrower, so you can run the chainring on the outside of the spider, which will look way better and give you more efficient, Graham-Obree-styleee pedal spacing! Just watch that the cranks still clear the chainstays. I bought a new (shorter) Campy BB from Condor recently and they agreed to take it back or swap it if it tuned out it wasn't compatible with the rest of my set-up after I'd trial-fitted it at home, so ask your LBS if they'll do the same. Or if you don't have BB tools, ask them to do the trial-fit, like someone else suggested. They would probably fit the BB alone for free anyway - doesn't take much longer to slap on the chainset, wheel and chain to check the line...
If you're gonna change the BB, maybe consider going much narrower, so you can run the chainring on the outside of the spider, which will look way better and give you more efficient, Graham-Obree-styleee pedal spacing! Just watch that the cranks still clear the chainstays. I bought a new (shorter) Campy BB from Condor recently and they agreed to take it back or swap it if it tuned out it wasn't compatible with the rest of my set-up after I'd trial-fitted it at home, so ask your LBS if they'll do the same. Or if you don't have BB tools, ask them to do the trial-fit, like someone else suggested. They would probably fit the BB alone for free anyway - doesn't take much longer to slap on the chainset, wheel and chain to check the line...