Since you cpu is multiplier locked, your only option is to bump up the bus speed.
Check your motherboard manual for the proper jumper settings to go to the next level after 100mHz (probably 105 or 112).
I have one doing 434 (3.5*124) on a BH6 using NEC cas3 pc100 ram. Seems pretty stable. So it may not be easy, but it is possible (by the way-- removed stock heatsink/fan-replaced with gargantuan hs/dual fan. Left cartridge intact though) Good Luck
[This message has been edited by jdebris (edited 07-25-99).]