440 heads whats better??

My bracket car had 906s with manley high flow valves, no port work and a rocker stand on one broke in the middle of a points season, needed heads quick so I got a set of the very first batch of the RPMs made. I changed valve springs, put em on and had to make new push rods, otherwise....it ran faster with the 906s LOL, thats tells you they wanted more cam than I was running at the time. Im gonna fix those 906s some day.