Another possibility is using Magnum heads from a newer 5.9. Running a zero-deck with these heads, I understand, takes advantage of the heart shaped chamber for quench. You'd have to use different pushrods and a magnum intake(mopar makes sinagle and dual plane and edelbrock makes a air gap intake for it) but that's about it. Oh yeah and the valvetrain which doesn't seem very expensive. I'm planning on taking this route with my 360 build. Maybe others who have used this setup can comment further...
-Alex