Probably not, but do a search for SoftFSB...that might work, but, if you're serious about overclocking, you're going to want a better motherboard. Additionally, the Pentium 4 (unless you have an engineering sample) can only be overclocked with the FSB. Typically, the FSB:Memory ratio will be set to 1:1, for optimal performance, which would mean you'd have PC3200 in there. Unfortunately, it being a Dell (or any prebuilt box), the memory may very well not OC high. You also don't have the luxury of voltage tweaks. Depending on your luck, you might be able to get anywhere from 3.2-3.4GHz, but that really depends on how well that CPU scales. If it's a "C" it's using the Northwood core, and is on the upper end of it's limits, so you may not get very far simply due to that.
A good, cheap OCing board would be Abit's IS7-E (or any IS7 board, save the IS7-E2 and IS7-V). I have one and it's one bad mofo.