It was 04sleeper that did E85 several years ago. I'm sure others did it before him, but he was the first person I remember reading about. IIRC, he gained a good bit over 100 rwhp from the changeover, but that was on a 4-valve with a
Whipple pushing a lot of boost.
With a stock head 2-valve (I think I remember that's what your's is) with an Eaton, I'd say 50-75 at most is probably more reasonable. Reason I say that is I don't know how much more air the Eaton can push through those heads before it goes REALLY inefficient; when that happens, it won't matter what kind of fuel or how much timing you run, it's going to be done. I know that 525 rwhp is about all an Eaton 4-valve will make without serious work, and that's with much better flowing heads. So I'm thinking 500ish is going to be the limit of the air that the blower will move through 2-valve heads. And if the airflow is the limit, it won't really matter how much timing you throw at it (i.e. race gas or E85).
If I had your setup and wanted more power on a $1000 budget, I'd port the blower and throw water/meth at it. Porting the blower obviously increases the efficiency, and spraying water/meth actually increases it a bit as well, plus the benefit of running more timing. You'd definitely pick up 25ish rwhp through a port, and easily pick up that much again with the methanol, maybe more depending on how fast you're spinning it.
Speaking of, what pulleys are you running/how much boost? Also, do you know what your air charge temps are? That'd give a pretty good idea as to how much you're leaving on the table through the spark timing.
P.S. If you decided to port the blower, I know a guy local to my area that will do it for a LOT less than any of the big-name companies, and he has lots of cars to prove that his ports perform just as well.[/quote