Duel point/ Tech drive

I assume you mean the cable driven style dist/tach. If it's in good shape, i'd keep it for a while. You could always ask around town for someone that does distributors and has a machine. My guy at Maryland Performance Center many years ago was top notch, and he used "Sun" equipment. A good operator can set points, change curves, check for wobble and generally check the overall condition to keep you running strong for years to come.