E85 carbed 6.1

You'll need new jets, power valve, metering block, high flow needle & seat, accel nozzle, and pump diaphram. I've done quite a bit of research on the conversion from gas and decided it's better (for me) to send in the carb to a company who does the conversion and let them build it for you. Most also will flow test or dyno the carb on a motor before they send it back to you. I am going to send mine to the guys over at www.raceone85.com. They will do the conversion for $350 and dyno tune the carb on a motor for you. It's only $50 less for the self installed kit (for 4150 style Holley)and you'll have to tune it yourself. The $50 extra is worth that in my mind. I also want to ask why do you want to switch over to E85? Unless you're having to run race fuel, the drop in fuel milege (30% approximately) outweighs the cost difference in fuel from gas and E85. If you don't care about mileage, I say go for it. I am only switching because I have to run race fuel and race fuel is anywhere from $5-$8 more per gallon than E85. I don't think you have to mess with your ignition box. They do recommend a certian type of spark plug for E85 though.