Unlike later cars, the early cars have a different 'path' for the sway bar.
I went from a stock sway bar on my 67, to Hotchkis.
Imo, it doesn't really matter what aftermarket swaybar one uses, or LCAs, the end links will not line up to the LCA swaybar tabs, for the perfect vertical end link setup.
Welding tabs on, or relocating existing, will get you there.
Unless it is a stock 67 swaybar with brackets, bolt the brackets on the swaybar first, and modify them to fit the k-frame.
DO NOT just bolt swaybar brackets to the k-frame, tighten them down, and bolt on the swaybar.
Hotchkis rear swaybar bolted on no problemo.
On another note, I went from a completely rebuilt stock suspension to QA1 UCA/LCA/Strut rods, PST manual steering box, retained the stock front swaybar.
Just doing that was a gigantic improvement in handling and the car went straight as an arrow down the road.
Check here, page 4, I posted a bunch of pics:
Hotchkis TVS with QA1 lower control arms