I think you can set the HT link in the bios, look into "chipset settings" and change HT Link to 1000Mhz.
Asrock boards have locked AGP/PCI clocks so overclock to you hearth's content. It wouldn't hurt to spend a little on some VRM heatsinks, like these: http://www.enzotechnology.com/mos-c1.htm
Better cooling for the NB would be a good idea. Put a 40mm fan over it or get a cooper heatsink.