You could try setting your BLK to 166 and leaving the rest at stock. Fill in your system specs in the user cp so we can see the rest of your components. I would worry about the PSU. 475w from an off brand could kill the chances of a decent overclock, especially if you have a hungry graphics card or other components.
I would not recommend overclocking an i7 920 on stock cooling. In addition, you need to go into the motherboard BIOS to see if it allows you to alter the base clock at all. Most computer manufacturers don't allow people to alter the bus's or voltages in the BIOS. You should be able to overclock the graphics card somewhat with tools such as RivaTuner though.
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