Odd Power Steering Pump?

If I were you I'd round up a used box and send it to Firm Feel for rebuild and pick a Stage of calibration. I have Stage 3 with a 900 psi Saginaw pump and it sweet to drive. My dad has the Stage 1 in his 66' Coronet 500 with a 440/4 speed and its way, way better than the stock box.