Check around here, CPU, All articles. It depends on the motherboard. The simplest way to O/C the chip would be to raise the FSB, changing it to say 112mhz would give you 504 (about the limit for that chip). An alternitive would be a multiplier change, K6-2's are unlocked. Changing from 100x4.5 to 112x4 would give the same final speed but everything else would be running faster (out of spec too).
You'll have to check the MB & see what adjustments, if any, are possible.