I fear that you and I may be SOL with the whole C2D thing.
I got an Intel D955XBK just before they announced their 975 chipset. I have yet to see anything claiming it supports a Core 2 Duo, but plenty of info to suggest it does not.
If anyone knows differently, please post. I'd be very happy to learn that I could swap out my 50,000 BTU Pentium D for a C2D, but I don't think it's going to be possible.
p.s. if anyone at Intel is listening, please consider!! Upgrading the MoBo is not an option at this point, unfortunately.