I'm building a 421 c.i. sbc, sparing no expense to acheive 700+ h.p. I am not familiar with all the different types of alcohol fuel available, so naturally, my choice is to use racing gas. I have been told by several racers, to go the alcohol route....they say it will increase h.p. by at least 10% over gas. My concern is....doesn't alcohol really shorten the life of your engine? Also....if I go with alcohol, is jetting the only thing I need to change in my carbs? Thanks. Dave.