I looked into this a long time ago and don't remember everything (you can probably find out more with a web search) but in general, the changes needed included larger jets, increasing the fuel pump flow and possibly some internal material changes in the fuel system to accommodate the higher ethanol content. There were places that sold conversion kits (most all I remember were for V8's though) and also a few places that would convert your carb to E85. I didn't keep the list because I discovered the the fuel mileage would decrease by 20% and abandoned the idea. But a web search would almost certainly lead you to anyone who does those things.
Sorry I couldn't be more help.