In this very section there is a stickied thread named THE ULTIMATE INTEL THREAD or something along those lines. In it, you will find many different helpful threads including an overclocking guide for c2d(which you have) and c2q(the quad core version of what yoy have). Give it a read, a try, and let us know where you get hung up!
http://www.overclockers.com/forums/showthread.php?t=515316
Your 'stuck sensor' issue, as you noted in another thread, is at idle. There you already said you reached temps of what, 44c....now you are reaching higher for whatever reason, so, as you knew earlier, its stuck down low, not high. Sensors get more accurate the closer they are to their limit/tjmax.