72 Duster Resurrection

Yep torsion bar and LCA hold the pin in on the back end and the LCA poly bushings rotate on the pin. Strut rod really holds the lower arm from being pushed back. Since you have polyurethane lower inserts, you will have to torque the pins into the K frame then install the lower arms. I would wrap the pins in multiple like a lot of layers of aluminum tape at the back end to prevent the pins from getting marred up, then grip em w a vise grip or pipe wrench to hold em, and torque the nuts down. Then install the lower arms.