You're running an Intel brand board, so there are NO options to o'c your proc in the BIOS. You might be able to try one of the software o'cing programs available, but most results seem to be iffy, and you will not have the option to lock your AGP/PCI ratios.
Your core stepping is B0 which is not a great core as far as high o'cs go. You can check the CPU database on that stepping, I had played with 3 or 4 and they all crapped out at about 133fsb. If you can get ahold of a C1 or D1 stepping, then you could reasonably expect 150fsb or more. I have 2 right now that do 165fsb at default vcore.
Your best shot at o'cing your proc is to pick up a cheap, used i845 board with lots of o'cing options like an Abit BH7 or Asus P4PE. If you have more $$$ to spend, then ditch your whole setup in favor of a good i865 board and P4 "C" proc. Don't forget that you'll probably have to upgrade your memory, too.
The setup you have now is a very solid, stable platform, which should last a long, long time, except that it runs at stock speed.