the right heads!

ok i just talked to my builder and he says he would like to see me put edddie rmp heads on this engine! the Js he has for me are bare heads and by the time i buy valves, springs, retainers, guides, etc. i will be better off with rpms! how much are a bare casting set of J heads worth? they have big valve openings and have been ported! just so i know what im dealing with!