I'm in the same situation, with an XP1600+ AGKGA Y. I'm game-stable at 148MHz FSB.
I suggest you should be cautious about VCore. Any VCore above what's required for stability only results in more cpu heat, which just adds instability. Same goes for DDRam. The sweet spot for my system is 1.8V VCore, 2.65V VMem.
Hope this helps!