I think the answer to your question is probably no because I don't think that many have been successful at running the bus that fast. You can pose your question in the K6-X Series forum at www.amdzone.com/forum. And I believe you'd need the latest BIOS update to have those speeds available unless you use software like CPUCool.
I have that same motherboard and I have only been successful in running my bus as high as 112 mhz without sacrificing compatibility/stability. Beyond that, I get MMX errors and somewhat unstable performance. Most of the people with this EPOX board are able to achieve 600 mhz with a K6+ CPU.