I recall seeing an article,in Hot Rod,stating that all Saginaw steering boxes
made for Passenger car will interchange,beware though of metric boxes made after 1981,there are different hose fittings for the power steering boxes,you will find that this topic has been discussed here before.
Hope this helps
Owner of a 1971 Chevelle
They mate like rabbits, I had 2 last month and now I have 6.
I put a 72 Impala Box in my 64 and went from 4 turns to 2 1/2. No end cap change and still have full turning. Use the pitman arm for the car it will be installed in. Up to 79 will bolt right in from any passenger car. After that they had metric lines and require a hose change. The only mod I made was to the end of the steering shaft, the 72 coupler had one 5/16 stud and one 3/8 stud the end of my shaft had two 5/16 holes and I had to drill one out.
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