Sure they do, and there's a matching taper in the frame rail. That's the story I had heard before too. I had them torqued to 150, no way they were going anywhere they weren't meant to go.
Then another reliable source told me there is room for adjustment and I should check that, then I started measuring and found the K-frame wasn't square to the car. It took a couple of cycles of loosening bolts and shoving things around but eventually I got it where it needs to be.
I can't say how that happened, but it did. I'm just glad I didn't go ahead and wail on the tube that was hitting the steering coupler.