Stock rockers are best. You will probably need more octane than e85 has to offer for pulleys that small without an intercooler, unless the e85 in your area is over 85%.

You are going to have a hell of a time with this build. Get a junkyard motor, put a cam in it, slap on an intercooler, feed it with e85, and you'll have a mid 12 second car on street tires all day long.