Ok Can't answer this one myself Magnum Intake on an LA head

You could have the heads drilled to accept the magnum intake. I'm not sure what you'd do about the motor mounts though. A mag engine has motor mounts that bolt to "pads" which are aft of the ears for an LA block. You can swap a LA for a mag, but not a mag for a LA, not without custom motor mounts and some welding. As mentioned, go get another 5.9 mag, it's a lot easier and more powerful.