Just found this on the QA1 website:
Part #52308 (lower control arm) is only recommended for 1962-70 B-Body applications with no sway bar or E-Body sway bar and QA1 K-Member #52315.
Part #52308 (lower control arm) is designed to work with the E-Body sway bar and the 1971-72 B-Body sway bar.
Looks like the QA1's E-body lower control arms only works with QA1's K-Member. What is the difference between the stock K-Member and QA1's K-Member? Anyone?
This is just ridiculous!
No I'd say they work with a stock k-frame the difference is with or without sway bar tabs. And A-Body have different sway bar mounting tab location through out the years.
quote
"Lower Control Arms
QA1 offers Mopar A, B and E-Body control arms with sway bar tabs. These lower control arms are a direct bolt-in on your factory k-member and are twice as strong as factory arms and don't add any weight. The set includes bushings, pivot arms and nuts for ease of installation.
Note: Part #52301 is designed to work on only factory cars and any A-Body that was swapped to disc brakes with factory parts (large ball joint).
Part #52307 is designed to work with the 1964-66 A-Body with no sway bar and the 1967-73 A-Body with the 1973-76 sway bar or "flat bar."
Part #52308 is only recommended for 1962-70 B-Body applications with no sway bar or E-Body sway bar and QA1 K-Member #52315.
Part #52308 is designed to work with the E-Body sway bar and the 1971-72 B-Body sway bar."
Your rubbing issue comes from the lack of stop tabs.