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Around .80-.85ish seems to be what you want to shoot for (So far my car has liked .82), so around 12 on AFR.

That is a great starting point. I am currently running 12.3 on the gasoline scale (0.83 Lambda).

After that, tune with the timeslip to see what your engine/combo likes the best. E85 is very forgiving and I have run 0.79-0.90 Lambda (naturally aspirated) with no problems.

1993 Daytona, 5.50 at 130mph (1/8) 1.19 sixty ft (PG). Link to 572 B1 - Part 1