Yes, any power steering gear box up to 1980 1st design will work for your year, since you need a gear box and a pump you can use the later ones as well but 1980 2nd design and later used the metric pump with the O-ring lines instead of the flare fitting lines. The only exception is you may need to change the rag joint to the proper one to mate your steering shaft back to the box. GM used two different size input shafts which each requires the respective rag joint to work.