It's probably not worth buying new bindings for those old skis. You may however find an old pair of skis for sale with functional all-metal bindings included at a reasonable price.
I find that old speed skis still do what they were made to do fairly well, but for SL and GS turns, the modern equipment is much much better. If I were you I would upgrade the skis. So many choices. Start a new thread and maybe we can help you out. You will have to tell us where (location) and what conditions (hard snow, on-piste, soft snow, in the woods, etc.), and how (speed and turn size) you plan to ski.