We built a pretty health 418 (11.8 to 1 compression, fully ported Eddy's, Bullet solid flat tappet .625 lift and 268 @ .050 on a 106 center) for a buddy's car and he put a tunnel ram with 2 660 center squirters on it running it on E85. It runs great wide open but it runs pig rich at part throttle. The 660's don't have a provision for a power valve so he bought a couple metering blocks from a fellow that was supposed to know carbs and E85 real well. The guy put .076 power valve channel restrictors in the blocks and told Brian to run 86 jets in all corners if he used no power valve but didn't say what to run in the fronts if he did use a power valve. I did the math according to Holley's formula figuring jet area with those huge restrictors he'd need to drop the primary jets down to 67's which I can't imagine will run right on E85. I think it'll be way lean at part throttle with 67's. I think we need to put in smaller restrictors, something on the order of .060's and run 76 jets in the front (10 jet split front to back). My thinking is it doesn't matter what fuel you run you need it balanced between the front and back barrels but I thought I'd post this in hopes someone here has some E85 experience that might tell me if I'm right or wrong.