Okay - First off Wayniac is right, GB motherboards seem to hate overclocking with a vengeance.
Fortunately for you crap6892, I recently got duped into buying a GB mainboard, so I may be able to help
The first thing I'll always do on a GB board is press CTRL+F1 at the main screen, this enables all the (Sorely limited) features in the bios, and I know in the older (pre 64) boards it enables the overclocking options, which did precisely nothing for me beforehand (except FSB)
Like Elbatrop said, the CPU multiplier is locked, so that's out for overclocking (not entirely, but too difficult for me to risk just yet) However, FSB and RAM timings are still available for overclock.
Just a couple of questions to let me better help you;
1: Does this Gigabyte board come with a RAM timings 'Auto' option? They usually do, in the CTRL+F1 options, right above cas latency and other RAM timings.
2: FSB doesn't seem to change? Are you sure you're saving your settings? Thats quite unusual.
Also, about using a different BIOS from another motherboard, Please Don't. Seriously. Most programs won't let you install an incorrect one, but still. Just Don't. OK?