Although most of the interest has shifted to the current socket A platform, there is still support out there for the older slot A's. I'm sure that if you keep this thread near the top you'll get some responses.
Now on to what I think I know about that chipset. The KX133 was the VIA chipset for the slot A processors, this chipset was designed before the advent of the 266MHz FSB CPU's and like the subsequent KT133 chipset, it doesn't "officially" support FSB's much above the 110MHz range. From what I've seen in the CPU Database, this holds true.
As far as overclocking this chip, if you follow the generally accepted practices, you show be able to get a substantial increase in speed / performance. Make sure that you have adequate cooling, good memory and capable peripherials.
Although I'm not personally familiar with that motherboard, many offer an asynchronous setting to run the RAM at a higher bus than the CPU. Sometimes a jumper, 100 / 133 or in the BIOS. Check your motherboard manual or the manufacturers website for details if this applies to your board. You will also probably need a "gold finger device" to be able to adjust the multipliers on the slot A boards. Maybe somebody more familiar with these boards will clearify this.
I hope this helps, Good Luck!
Research, the key to a successful overclocking experience!