aaeq.net is the mfr, you can get complete heads from them. Also clearwater has an ebay store and they'll build them up for you to spec if you tell them your cam. Hughes will also, I think aaeq will use different springs if you give them specs. What ever you do, don't buy bare heads like me! I spent over $900 on the rest of the valve train to build them up.
There's several threads about Engine quest heads here and at dakR/T in the last couple of weeks.