need help choosing cfm fan for 350

I want to buy an electric fan but I dont know how to choose what CFM the fan should be. I have a 350 Im building with 375hp. Im looking at a 3300cfm fan on ebay but I want to be sure this will be enough to cool me down. I have a 3 core radiator too. With the current flex fan I always run a cool 185. What size electric fan should I get?

I would also like to know what fan to get, similar setup probably around 375-400hp but ive got no clue what size fan is best.

Most people use the taurus and mkvIII fan. Cheap from the junkyard and actually outperforms aftermarket fans. I have one coming to me in the mail right now. Here's a link on how it all works. (its a mustang install, but it all works just the same) http://www.fordmuscle.com/archives/2003/02/electricfan/index.shtml