Can I use 64-bit Windows 7 on an Early 2008 iMac?

According to the official support page, 32-bit Windows 7 is supported, but I have seen listings elsewhere that this machine meets Microsoft's specs for 64-bit Windows 7 "with the correct drivers" and that people hve successfully installed and run 64-bit Windows 7

I am on 10.8 and used Boot Camp 4 to create a "drivers" install DVD. Will this contain the drivers for 64-bit Windows? How can I install it on this Mac?