I have a 72' chevy 454 with a 750 holley carb what do I need to do to switch to e85? compression is 11:1 please email me [email protected] I have heard that you need to increase the size of the jets in the carb and change out the float and fuel lines. What else? This I think is worth it cause I need to run 104 octane and it cost more than $10 a gallon. e85 is around 105 octane and it about $1.50 a gallon.