e85 on the street??
It's not just your carb that will need to be modified, it's your entire fuel system. Standard rubber fuel lines don't like ethanol. It breaks them down making them brittle and prone to cracks.
And it's not just your car either. We don't 'officially' have E85 in my area of SoCal but Arco gas contains various percentages of ethanol. I just took my two-stroke garden string trimmer in for repair over the weekend. It started OK but then wouldn't run under any type of load. Turned out the fuel line was broken from exposure to the ethanol in the gas. They say it's now got carb issues as well. $60-$80 bucks to fix the beast - still cheaper than buying a new one.