Question: Why overclock now when you say you're getting a better board? I personally wouldn't risk the overclocking but I can't call myself part of this place if I said don't.
RGone and I have different standards as to what's safe. My max volts are 1.55. However, I trust my hardware. I think the value RGone has given you is a great safety estimate as for your max 24/7 overclock on your hardware.
No you won't (read: an infinitesimally small chance that can be practically 0) blow your motherboard. You might have to loosen some timings on the RAM if you increase the FSB, but that is very individual based. Or you could change your FSB and multipliers so that you don't have to loosen the RAM timings. Either or, these choices are effectively up to you.
What I would not recommend is let the fx-6300 get above it's thermal safety threshold: 62 degrees Centigrade. But I'm assuming you know this already.