e85 or stay with pump gas

My engine is really not gonna be a huge power house but I would like to get what I can from it (550ish) but what I've seen the factory port design heads are ending up around 530 ish
Hopefully it will run 6.70's 1/8 mile
And I will compete in the 7.0 index class
At our local track
I've been building the car for about 2 years now and really don't need to complicate things right now
But I'm liking the cooling advantage
And flyfish you say you went 2 Tenths faster over pump gas ??
Hate to spend more money on a expensive carb that I've already bought
Also a little concerned about starting a fresh mill on something that I know nothing about
Anyway just some of the thoughts in my head