Doug,
For what you're doing, you'll definately want larger valves and springs matched to your camshaft needs. On the complete Ed heads you'll be pulling out the springs, valves, retainers, and locks.
You'd probably be money well ahead to get bare heads, or heads built for your application. Barry's FElony heads come to mind, as they flow better, have the large valves already, and you can spec the springs you want.
I have a set of ported 60069s on my street car and wish I could go back and update with larger valves and update the ports to match, but I've sunk a bunch of money in the heads already.