If it were carbed, I'd say call Mark Sullen and be done. It has been tested that a reading of e87 often makes the most power. Getting into the e98 range makes it much harder to lite off, and is not needed unless you have extreme compression,boost, etc. There are many cars in the 13+ compression area that are fine with e85. If you get into mixing your own that can be a real pain in the a$$. To get the most out of it, get a tune done by a tuner that has experience with E85 and can provide references. E85 is a different animal and can not be treated like gas, race gas, or methanol.
..5.95 @ 115, 1.30 60', naturally aspirated.
1991 notch, dart block 427W, , AFR225's, super vic intake, solid roller, UCC 8" converter, glide, Carbureted E85, 28" radial.