UPDATE: Was finally able to install Windows 7.
Solution:
I bought a new RAID card for the machine. This was able to work with out a RAID set defined. So I created my RAID 10 set and restarted installation. This failed. It did not understand.
Was able to download a driver from Adaptec for W7 x64 after multiple tries.
New driver found set and also saw old RAID controller. (Go figure!)
Anyway, it is installed and functioning on an uncertified Dell Precision Workstation 670.