Well, the four link install has been a time consuming challenge. The instructions show the front mount as an angle iron type that slides up under the bottom of the frame. The actual mount for this application mounts flat on the side of the frame. They do include measurements from back of a typical short frame to each of the bolt holes, but no guidance on placement vertically. Because I shortened this frame, I calculated everything off the CL of the rear axle.
I made my best guess on one side, then leveled over to set the other.