As far as I have read and seen you will be fine at 9.5:1 on e85. If you need to you can run meth injection also.
Is this your 700HP Small Block Build?? You may need to think twice about using an 200R4 Tranmission cause your gunna be making some serious power!!
On another note, I ordered my Trans today. I went with a 727. Remember on the Boosted build you don't need a 4.10 gear. I will be running a 2.76 with a 28" Tall tire. Should go down the road 80MPH at 2650RPM.