Build me an Alky 440

Bobby, what are the advantages of running alcohol. Some people say they gain 2-3 tenths in the quarter others say they dont gain anything it just make the engine more responsive and makes them more consistent. What about corrosion in the fuel system? It seems like it would be a little cheaper to run alcohol than 112 -116 octane race fuel even though its suppose to take about twice as much alcohol as it does race fuel.