Just a note of caution, overclocking with the pencil method is very risky as you can easily fry your chip !!!!
You could try putting PC133 memory in and then increasing the fronside bus, should you manage to get it to 133 this would give you a clock speed of 7x133 = 931
This is unlikey to run very well ( if at all ) so start with the smallest possible increase, run the machine for a while, see if its stable. If it is then go for the next increase, run it, etc etc
You will probably have to increase your'e cooling as well, so a mother of Processor fans would be a good idea.