Overclocking - [Answered] Overclocking a PII 350 Processor posted in the Hardware forums; Is it very risky to overclock my Pentium II 350Mhz processor to 400Mhz (by adjusting multiplier 3.5 to 4.0)?...
The attached tool will help you in your quest - it's really difficult with older boards to say whether they will o/c or not. Use the tool attached (it is totally specific to your board and revision).