If you want alot of good information get back issue of Performance Ford magazine April 2005 it has good info.
Also Phone guys @ Pumaspeed, Pumabuild, Primary Designs and Engine advantages and pick their brains. I've been doing this and am learning more and more all the time. I'm in the process of gathering info on this and like the Primary Designs set up with GT28/32 one off hybrid turbo but still not totally convinced after speaking to guy at Pumaspeed so I'm still considdering my options.
There is also bits of information on all of their websites appart from EA their site is still under construction.
Hope this helps