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.

For your rod length from my calulations and piston speed tell me that you would need 240 cc's of port volume and 290 cfm's at .600 lift. To efficiently feed the engine. But once again it's just my opinion.