Nice, I've been running mine on E85 for a couple of years now. More for the higher octane rating than anything else - it's basically race fuel with normal gas pump pricing. And the availability is a lot better.

On my car, I did it with the Megasquirt ECu that now runs the motor. When I built the 16V turbo motor, I put some really hefty 1000CC injectors on it, to give it plenty of capacity to support a lot of HP even with E85, or E100.

Then I set up the MS box with two sets of maps for fuel, spark, and boost control. DOn't need the laptop to switch - there's a dash switch for that. So one set of tables ges tuned for 93 octane gas, the other for E85. More fuel, morre ignition advance, and more boost for the E85. I'm not using a fuel ethanol sensor, so it's not really 'flex fuel' since it wouldn't handle in-between mixtures well, but I just need to run it very low on one fuel, tank up on the other fuel, then start it, wait a few seconds, then flip the switch.

On a cold start you can really smell the difference with the ethanol, a sort of sweet smell hanging in the air. Almost like you have a headgasket leak, but it's just a little unburnt ethanol wafting around.

I lose about 4 mpg on highway trips running E85, but then the ethanol map isn't rally fine tuned for high MPG, more for the 300 whp.
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'63 PV544 rat rod, '93 Classic #1141 245 (now w/16V turbo)