DISCLAIMER
I posted this elsewhere and had no comments.
For me, this just a mental excise.
I do not use E85 and I am not planning build an E85 motor.
Please keep this discussion technical and fight the urge to tell what you really think about E85.

Edelbrock‚Äôs E-85 Carburetor

Edelbrock's 600 cfm E-85 carburetor is scheduled to be available in April 2007

In the wake of the past year‚Äôs dramatic rise in petroleum costs, many auto enthusiasts are looking more seriously at alternative fuels.
Much of this interest is in the name of cheaper operating costs and, sometimes, cleaner emissions, but what if it could also increase performance?
Currently available at select fueling stations across the country, E-85 is a blend of 85 percent ethanol and 15 percent unleaded gasoline.
The motivation behind its development was to move further toward using renewable energy sources, but as a bonus, performance fans have realized that ethanol has a much higher octane rating than today‚Äôs gasoline; even as an E-85 blend, it manages a 105 rating.
For hot rodders, that means high-compression can once again be returned to street engine combinations To meet the needs of those interested in building engines to take advantage of E-85, Edelbrock is releasing a new E-85 Series of its four-barrel carburetor.
The E-85 version is rated at 600 cfm and comes calibrated for the alternative fuel.
The special application comes with a hard, anodized finish and powder-coated throttle linkage, plus a complete listing of all the other parts needed for a conversion.
The carb will be available in April 2007 under part number 1414.
Check www.edelbrock.com for more information.

By Terry McGean
http://www.hemmings.com/newsletter/newsletter.html?volume=2&issue=26&id=825&refer=new s&emlid=143560#825

Discussion Points
If a person builds a high compression AMC motor, use one of these E85 carbs or EFI, wouldn't it run as well on E85 as a low compression motor would on gasoline?
Get the same performance? fuel economy?
How high would the compression needs to be? 10:1? 10.5:1? 11:1?
What are the ratios of typical high compression pistons that can be purchased off the shelf?
Would a high compression motor require a different cam than a low compression motor?