I would not run e85 with your setup for 87, if you get the ethanol kit made for carbs, have someone install it that knows what they are doing and that has tuned for e85 before. Race fuel or ethanol will not perform to its full potential if your setup is not tuned for it. If tuned properly there is much to gain. (HP, throttle response ect.) Only issue I see as of now is very few gas stations currently carry E85, which can be solved if you buy a 55 gallon drum and fill that every visit. As for changes of your setup I would get the ethanol kit and make sure your fuel pump and fuel lines are efficient to supply enough fuel to the carb.