Excessive play in steering wheel ?

This could be a real dumb question. But my 66 dart has some serious play when steering. Like several inches each way when I turn the steering wheel. However the power steering is fracking awesome. Turns easier than my new cars.
So what is the culprit ? And is it an easy fix? Are there any other fixes you would do at the same time? Like shocks?
I want to say that I have worn Tie Rods. But I don't really know what that means.