I don't recommend this kind of OC'ng,u have to play with voltage to get a good result,here is the voltage range for Q6600 G0:
http://processorfinder.intel.com/details.aspx?sSpec=SLACR
Also i don't think its possbile to get a good OC (like 3.0 or more) with only FSB.you have to change the voltage to get better OC results and there are lots of more things,its really easy read the OC'ng guide+Temp guide and u will be fine: