CG height seems to be 16.5" for the FFR spec racer, just found it on the internet. I also had expected it to be a bit lower like in the 12-14" range.
I also found an interesting way of measuring it:
http://home.earthlink.net/~whshope/id31.html
This is another tabular approach:
http://home.earthlink.net/~whshope/id39.html