Per usuall, if you wanna real high oc, first thing is to push FSB to max till the PC doesnt boot anymore, then after last FSB (for example 400FSB) you lower down by 50 (350) and test out in windows is it stable, if not then you push North Bridge voltage by 0.1V also ram by one notch of voltage.
Since you're pushing FSB you are also pushing ram speed up, you can try lowering divider or lower ram speed (Ex. 1600 to 1333MHz).
You're gonna probably hit a wall at 400ish, also generally by every 200Mhz on core overclock (From 3.0Ghz to 3.2GHz) might need a one notch of extra voltage (1.2V to 1.25V).
CPU Voltage keep under 1.45V with good cooler.
Ram voltage under 1.7-1.8V.
If you dont have good cooler on CPU, like aftermarket ones , not intel stock aluminium crap, you can push oc quite with small voltage increase.