I prefer manual steering and just swapped to manual because my box needed to be rebuilt. It was sloppy and leaking like crazy.
The nice thing about manual steering is the box is packed with grease, no leaks ever. And I like the firm feel.
I bought a used manual gearbox with the manual pot coupler and pitman arm attached. I then bought a used manual steering column and swapped the shaft with my automatic column shaft. The manual column shaft is longer.
You can also buy a new extension that eliminates the need for the manual pot coupling and longer shaft. But it's about 100 bucks.
The job took about 6 hours. The hardest part was dropping the power box out the bottom. I have a 318 car and it was tight. Probably have to pull the exhaust manifold on a big block.