Nobody can tell you that for certain, as there are too many variables involved. For example you may have a great board for clocking but a lousy clocking chip or vice versa. The only way to find out what it will do is by trial and error.
Having said that, I think most E6600's should easily do 3.3GHz, when I had mine I got it up to 3.6 with nothing more than a slight vcore increase.