which heads for a 408ci?

I think the length of the rods would be 6.123. What kind of cfm would I need to get a set of eddys to to make that kind of power. I was thinking what like 280cfm at like .600lift. We have a flow bench at the school that I know how to use and we are soon getting a wet flow bench from joe mondello. It will be street/strip. What type of springs would I need for a solid roller only revving to about 6000rpm? Something like beehives maybe.