As long as prime95 ran smoothly without crashing for about 12 hours you've generally succeeded, congrats.
That is a really nice overclock though, what was the initally frequency of the FSB, 166MHz?
I'm just a bit concerned about your temperatures though, do you have any idea what your load temperature is? If not, download SpeedFan
or Motherboard Monitor 5
, run prime95 again and monitor your temperatures with one of them. If it gets above 60, you may wanna go about cooling it down somehow.