1- The 1st thing that you need for overclock your CPU (a decent overclock) is a CPU cooler, air or LC. Mostly air coolers ae enough for decent overclocks. If you have the stock cooler, start to think in buy one.
2- GPU are usually overclocked with the stock cooling that they have, in this case, the GTX 470 stock fan should be enough for a good overclock.
3- Excellent mobo, pretty solid and friendly to get a very good overclock.