stock injectors no tune 93= car happy
42.5 injectors no tune e85= car happy
stock injectors no tune e85 = car VERY LEAN
42.5 injectors no tune 93 = car VERY RICH.

No matter what you do you wont be able to easily switch between fuels, you have to pick one and stick with it pretty much. our cars don't have flex fuel capabilites where you can go back and forth.