Problems with i7 920 and cm v8 temps

Hey,

I've build my first pc a couple of months ago and I would like to overclock my pc now, but I don't know a lot about computerhardware yet.
I've been having a couple of problems with my temps.
I would get stock temps like 41 C with speedfan and 41 C 36 C 40 C 37 C with realtemp(tjmax @ 100) and coretemp at idle, and 73 C and 72 C 69 C 71 C 62 C at full load with prime95 (large fft), too hot for overclocking I think.

Last week I uninstalled epu-6 that came with my p6t deluxe motherboard, and now I get idle temps like 33 C with speedfan and 37 C 32 C 39 C 31 C with realtemp, my full load temps are now 60 C (speedfan) and 65 61 62 59 (realtemp), however I 'don't really know if these temps are right or wrong because changing the cpu fan speed manually doesn't really affect the cpu temps and when I'm checking the cpu temp in the bios its always at about 41 C.

Would my cpu temp in the bios be right and realtemp and speedfan wrong?
And if the truetemp/speedfan temps are right would I have enough room to overclock?
I've read that the max temp should be 67 C so maybe my temps under load are still too high?

Thanks for any help,