So the right ingredients up to now according to this thread to reach a high score:

Fastest k6 capable board up to now : Asus p5a-b
K6-3+ cpu
Fast ram: pc133 cl2 with tight bios settings
win95/98/me
DX7
driver 7.76
fastest vga that is supported by that driver: Geforce3 
Fastest Ali agp driver
Fastest Reg settings for that driver
Best overclock you can possibly get out of the board/cpu and even overclocking the geforce3 helps.
Run 3dmark2000 with default settings.