What's the difference between steering columns?

You do get what you pay for with after market columns. Read this:

https://www.lvvta.org.nz/documents/...-2013_Unsafe_Aftermarket_Steering_Columns.pdf

I have a Flaming River tilt. It is sold as a drop in for 69-down B-Body but fit my Dart perfectly other than shortening the D shaft, which is removable. You can get them for you 72 as a drop in with or with out the switch in the column and power or manual steering. Keep in mind your steering wheel may not fit well as in there will be a mismatch and gap when installed. I ended up buying a GT Performance steering wheel and GM Adapter, which looks great.

Here is an example of a drop in for you car. I guessed on Key and steering box.

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To me, the price difference isn't worth the safety risks.