OP, if it were me (with a standard bottom end), I'd be putting -9's on it, pegging it at 23 psi or so and make a responsive 340-350 on E85 - seeing that you're going down the E85 route anyway. The car will have much more area under the curve than a -5 car. I really think -5's on a 2.6 are still a bees dick too big. They really need a stroker.
I'd offer my own car up for a drive but my box is
deaded and its not really a fair comparison to what you're going to get with a stock engine.