Different Carb or EFI

I had a '69 Valiant a few years ago with a 400 in it, I went through Rich Nedbal at Mopar Engines West to get my FAST XFI system, he'll set you up with everything you need, and I can't say enough good things about him or the XFI system. It made a WORLD of difference on my car, with cold starting, throttle response, fuel mileage. Just to play around, I would fill up with e85, and you only have to change one thing in the program to switch between gas and e85