You should probably be fine, keep an eye on temps though if you haven't been already. Find a download of SuperPI or Prime95 and stress test things to see if your OC is stable. But with such a small jump, I can't imagine it wouldn't be.
If your cooling is sufficient, you could easily go higher. What ram do you have? If it's good, you can just keep increasing the HTT, you may want to drop the HT multiplier to 4x if you get much higher though. If you have value RAM, change the RAM divider to 166 and keep going.
You'll see the heat creap up with higher clocks, but if you try to up the voltage is when you'll see bigger jumps.