If my current 440-1 heads need to be replaced i sure would like to reuse the valvetrain i have. There are differences like intake valve location and less angle on the valves. If the intake rockers have more offset built into the rocker body then it might not be possible. I use shims to center the intakes so i have some room to move them. The other issues may be length of the rockers from shaft to roller tip? Any other issues that may come up? If i recall the 572-13 heads use the same casting as a 440-1, which makes me think it may be doable. The other question would be valve reliefs. 2 degree angle change and .050 move on the intakes. Thoughts?