I also have a 73 up long pump on the longhorn, & used the 73 up lower hose. also the lower neck was changed on the radiator. the later rad has a smaller straight neck,so I had the tank end of the neck expanded (at an ex shop), then soldered the neck in. If your rad is in good shape, a rad shop should be able to change the neck for a minimul charge. Good luck......crazy AL
