If you can get it to 100 FSB, the busses will be back in spec, which is where you ideally want to be.
Whe overclocking, your target goal is the next point at which the bus is in spec. These points are 66, 100, 133 FSB. If you have a 66 MHz chip, you want to shoot for 100 FSB. 100 chips shoot for 133. Above and beyond these points will throw the bus out of spec by degrees. That's why 83 FSB is a killer. The bus is SO far out there, you usually wind up with all kinds of data corruption, etc....
Something to think on....
Mr B