I have a Veloce crank, Shimano 105 rear deraillor, and SRAM/Shimano 9 speed cassette. Will these marry? Will they all accpet the same chain? also, I have a Shimano 105 front deraillor
Cranks are cranks, as long as the FD is made to shift as big of an outer chainring as it has on it, and you've not trying to shift a triple with a double-specific FD, you'll be fine. What are your shifters?
Simano 105 Double Front Deraillor, Shimano 105 Downtube Double/triple Compatible
I think you will be ok. It is worth a shot, anyway. I have seen Shimano cranks on many otherwise Campy bikes at the LBS.