Both that motherboard and that CPU are on the
tested compatibility list so it should work fine.
If you can't find a premodded BIOS there are instructions at the place I linked to that explains the procedure, which basically deletes Pentium 4 compatibility (to save space) and replaces it with Xeon (yes, Core 2 is still in there as well). Just as well to do it yourself because you don't know what's in the premodded ones (most of those are on a Russian site and a Polish one, or some random guy) and they may contain things you don't need like SLIC table mods or Fernando's later Intel RAID ROMs.
BTW G41 chipset has a hard FSB limit around 340MHz that requires heroic measures to go above, so don't count on doing much overclocking. That's why it's good that you have selected a chip with a high multiplier.