9-speed or 10-speed? The chain and rd are no problem if your shifters are set up properly.
Campy and Shimano 10-speed cassettes are reported to be so close in spacing that they are interchangable. However the reports are mixed with some saying the shifting is very good and other saying it's a bit ragged.
For 9-speed the reports are similarly mixed.
To guarantee compatibllity, get a Jtek Shiftmate which will allow almost any mix-and-match to work nearly perfectly. I'm running 10-speed Campy Ergo shifters on a 9-speed Shimano cassette and 105 rd with a Jtek and shifting is flawless.