906 heads and 740+ NA horsepower?

I had to pull the 906 "boat anchor" heads from the shelf yesterday and strip them, so I thought I might as well take some pictures of them as we had no pictures from years before. In 2011 we used them in a Mopar Muscle Magazine dyno contest at Comp Cams and they have been sitting lonely on the shelf since then.
If you don't mind what did they flow?