Sounds like their poor instructions and bad mounts haven't changed in decades. I put an Addco front sway bar on my 69 Dart ~1992, bought via J.C. Whitney. I recall it didn't explain exactly how to mount the brackets to the K-frame. Mine looked like 71 Swing's, and hung down so far you could see it looking at the front.
For my 65 Dart, I will try using a junkyard Volare sway bar and connect it to the strut rods at the LCA, as my C-body does.