72 Pro Street Dart

I am debating on doing a custom 4 link set up for it or leaving it leaf springed still dont know i will spend almost the same with the complete caltrack setup or doing it 4 link myself, what you guys think?
In one hand the car will have a better rear suspension and in the other hand it will not loose its stock suspension status, still dont know i think when i get to that point i'll deside!