The guy in the service dept. at Harley, that races Buells almost every weekend. Said, "Use the stock cams, just do some head port and polish."
I asked him what about when I put my 88ci bigbore kit on? He said, "Stock cams. You'll have a hard time keeping the bottom end together if you get crazy with your cams." He's raced and entire season before on a stock XB9 motor.