Quick Steering box ID

Just picked up a '64 Dart 270 and want to improve the handling. I'll be doing a disc brake and steering work. Here are my questions.

How do you identify the optional quick (16:1 ratio) manual steering boxes as compared to the standard 24:1 unit?

What car models and years were these 16:1 boxes available. I have read that steering boxes from "B" bodies and possibly others are interchangable.

Thanks,
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