Not really familiar with overclocking non-sandybridge chips, only thing I know is it requires a lot more effort and fine-tuning to get right. Look up a guide maybe? Or perhaps someone here can give you a really brief rundown of some basic settings you can switch.
Here's a really neat guide I found (PDF) based on overclocking an i7 920 + X58-UD5 setup:
The BIOS stuff should be 99% similar to yours. GL
On another note, followed Cantii's advice for a cooler-running GPU and installed a Prolimatech Vortex 140mm (bottom intake):
It matches the rest of the case just fine when the other LED fans turn on