most systems can be overclocked to around 10% if the RAM and CPU are from the same era, so you should be able to kick out an extra 233mhz (or 0.233ghz), if the ram is much newer than the CPU, ie it can support higher clockspeeds, then you should be able to get about another 50% before any problems.
so yeh, 0.07ghz should be totally safe, the best ting to make sure is do a google search for any reports of people overclocking the same CPU you have, most results being from tech forums or hardware review websites.
however, in this day and age, overclocking isn't that dangerous. it's pretty much standard for motherboards these days to have a physical reset switch in some form, incase you overclock so far that your pc wont turn on anymore, you can flick the switch and it'll reset the FSB and mltiplier back to normal. infact, my motherboard does it automatically if it detects the clock is too high, without even needing to reboot, im guessing most new motherboards will have such a safety feature.
im just a little annoyed that the CPU
FAN is being sold as "overclock proof", it's purely an advertising gimmick to take money from the poor souls who arent so.. informed.. of how it all works. the fan has very little to do with if your pc can overclock. sure, overclockign requires better than average cooling, but that's mostly down to the heatsink, not the fan itself.
so conclusion, you're only wanting to overclock your motherboard by 70mhz.. thats like what, the extra added power of a couple of digital watches, wont do any harm, but you probably wont notice much performance increase. i'd be willing to dare you to try a 200mhz overclock, you'll notice a fair amount of performance increase, without much risk of problems.