The P4 CPU multiplier is locked by Intel. I know the 8IEXP has the setting in there, but it is greyed out and you can't use it. Don't know why they do that. You should be able to adjust he FSB by 1mhz increments all the way to 150+. Thus, you'll overclock the CPU. You may have to adjust the CPU Voltage, but I wouldn't go over 1.7V. Also, set the PCI/AGP on 33/66 which is locked or you'll be overclocking those as well, which is not what you want.
If you are going to overclock, get used to where the CMOS jumper is on the motherboard, because you'll have to reset it if you run the FSB so high to where you can't boot.