I did a little Googling, and there is some information out there. One site I found listed the max FSB as 97 MHz.
If you take a look at the motherboard, there may be silk screened charts that have the jumper settings for voltage and busspeed and multipliers.
50 to 100 MHz is generally the best you can expect for a K6-2 overclock.
Better cooling, more voltage (don't go over about 2.8) the usual stuff.
Don't forget, the clock setting of 2X is read as 6X by the K6-2.
If you are doing this for fun, have at it, but you won't see a whole lot of performance improvement for your time.