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I would think with that high of compression you would need a colder plug than that! And I read in mopar muscle that in order to use E85 you need to switch parts of your fuel system such as the rubber needles in your carb. The rubber are the things that E85 will deteriorate over time. I could be wrong! Anyone read that issue from 4-6 months ago? it was the one guy's Valiant that they did it to.

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Definitely, 85% alcohol requires special items like needles and get rite of rubber from the fuel system.

To the OP, I wouldn't store the car with E85 in it, I'd get it out of there but fast and run some straight gas threw there without ethanol in it.
Most of the gas sold nowadays has at least 10% ethanol in it which sucks for performance and storage. Straight 100% gas 91 without ethanol is way better than 91 with 10% ethanol blended, way better.But hard to find nowadays.