Unless the old board uses the same hard drive controller, you are going to get a blue screen on first boot. It might work if you boot off the Windows DVD and choose a repair installation. But it can be messy.
Ideally, you would move key data to other drives before doing the upgrade, remove all drives but the SSD, and then reinstall a fresh windows on the SSD. When you plug disks back in the data will be there, but you'll have to reinstall all software from original media. It's a lot more work, but the system will be cleaner.
If you have your two WD blacks in a RAID, those are hard to move to a new system unless the RAID controller is identical.