It is very doable, and not difficult at all.
basically you need to add about 30% extra fuel flow. Use timing appropriate for a 105 -112 octane fuel, and you are good to go.
AFR's on a gasoline calibrated wide band will probably be about as below. These are what I run on my turbocharged Subaru WRX.
Idle it likes 13.8:1 or lambda 0.94
light throttle cruise up to 1 bar to 1.3 bar manifold pressure you can run 14.7 - 15.2 (lambda 1.0 - 1.03)
moderate acceleration boost up to 10 psig, 12.0 (lambda 0.82)
WOT max load 12.0 - 10.6 (lambda 0.82 - 0.72) depends on what the engine likes.
You might drop over on one of the E85 specialty boards and check in for some real world experience with the fuel.
http://e85forum.com/index.php (performance oriented forum)
http://e85vehicles.com/ (general e85 discussion and conversions - less technical/performance oriented)
Or you might find my E85 FAQ on one of the Subaru boards useful:
It is currently 67 pages long but the basics are in the first couple pages.
http://forums.nasioc.com/forums/showthread.php?t=803341Given the age and origin of the car, you will want to replace all your rubber fuel hose with modern EFI rated fuel hose. It seems to be very tolerant of E85. Any rubber diaphragms like in fuel pumps or carburator accelerator pumps etc. that contact the fuel might need to be replaced. Cars manufactured after 1990 are generally fine with 85 but the earlier manufacture cars may have some issues with gaskets. Rubber/cork composite gaskets are one "do not use" material. Does your fuel system include any zinc or magnesium components? If so you want to replace them with other materials. Fuel compatibility is generally an over blown issue but it is something you should pay attention to on the older cars that might have pot metal carburetors etc.
The fuel itself is fantastic for boosted applications it is practically detonation proof at any reasonable mixture and timing on boost levels likely to be run on the street. It also with no other changes will give you a 5% 10% increase in midrange torque and power in most cases.
Larry