On a 71 Demon, if I go from power steering to a manual steering box, would I also have to change out the steering column?

yes, or use an adapter with your column.

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Never heard of an adapter for a steering column. Can this be purchased...possibly from you?

Many of the steering and suspension parts suppliers carry the PS to manual adaptor. (Firm Feel, PST, Steer & Gear, etc.)
Also look at ebag
DD

There are two steering column lengths power(shorter), and manual steering(longer column, shorter box)... for a power guy to go to manual you need the adaptor( "extension")....for a manual guy, that gets a bit tougher...(column swap, column shaft swap...)

-D.Idiot

Bear in mind the manual and power boxes have different size inputs and spline counts. I can't remember the difference ( I think the manual is bigger.) Make sure whatever adapter you order will have the proper male/female ends to work in your app. The factory ones didn't and neither did the early aftermarket ones (mid 90's) I looked at. And rebuild your joint while it's apart!

-James

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