Call Hitech Motorsport in Ramsey, Mn. Talk to Brian or Bart, they can tell you all you need to know about E85 conversions as they have been doing them. The conversion can't be too extensive as they do for roughly $800 with a tune.
http://hitechmotorsport.com/index.php?option=com_content&task=view&id=29&Itemid=96
http://hitechmotorsport.com/index.php?option=com_content&task=view&id=29&Itemid=96