1967 Barracuda column collar question

That screw doesn't look stock. You don't need to pull the whole column to install the proper fasteners (like what Cuda Al shows in his photo). You do need to remove your turn signal switch (yours is toast anyway), the 3 screw retainer plate, and the upper circlip for the bearing. Lube it up good with some penetrating oil and pull that housing up and off the column tube. Install the proper fasteners and leave them loose until you get the housing back on the column tube and the square heads back into their respective slots. When you tighten the nuts, the square heads on the studs will slide into place and hold that housing tight. They're kind of a wedge fit.