sway bar

As stated on QA1 site:

Notes:
Part #52307 is a direct fit for 1973-76 A-body. Will work on 1967-72 A-body with QA1 K-member and sway bar, and 1964-72 A-body without sway bar.

So you'll likely have to fab tabs for it to fit or find a company that will bend you a bar that will fit.

Got any pictures of the fitment issue?