And that is the version that flashes, H3A.739. Anyone who has followed the link and downloaded the modified bios has seen the comments below and it's part of understanding the next step. I left my 650Ti card in at first and it complicated the flashing process for me, once I removed the card and used the HD4000 graphics built into the CPU things went great. At some point I'm going to want to tackle using an external video card again but for the time being its good and 100% functioning.
I used a flash drive with ML 10.8.3 and once it was done it rebooted and I was good except for on board audio, there are a couple of fixes for that out out there including in this thread.
Welcome to The HermitCrab Labs
We like to present you our first Ozmosis (OZ) release!
Click on the link above, download OZ and unzip to any Fat32 USB flash drive.
Restart with USB flash drive and tap 'End' Key on reboot.
Flash new BIOS
After system verifies flashing, computer will reboot twice.
OZ Boot Manager GUI
Tap HOME key
Use mouse to select OS to boot into. You may also use F12 to access BIOS Boot Manager and select your favorite OS. Simply tap F12 on boot up.
Verbose: When in Boot Selection Alt + V (fixing bug please just tap V once) and then make your choice.
Install from DVD
Insert 10.6.3 DVD
Select Mac OSX Install DVD
Install your compatible [OS specific] GFX
After flashing Init Display and Integrated Graphics will be set to AUTO To use Graphics Card set Init Display : IGPU, Integrated Graphics : Enabled