Well if you are going to keep the dominator and switch it out to go to the track you need to stay with a dominator unless you want to mess with adaptor plate.
I'd put a 750 Dominator on it for the street if you can get one for E85.
So I assume you are going to have someone convert your 1150 to run E85? I have been told it isn't as simple as just buying a kit and doing it yourself.