First step to restoring my 1974 Duster; Front End rebuild (coilovers needed?)

Looking closer, I don't think the LCA comes with the kit, it is just showing a rebuilt LCA. If you haven't rebuilt your LCAs yet, I'd find a set of factory LCAs with sway bar tabs and rebuild those as opposed to yours, which from your pictures have no tabs. Before you rebuild (or have rebuilt) your LCAs find the excellent video on performing that procedure found here on this site (SOMEBODY HELP TO FIND THAT VIDEO!!!). Installing the stiffening plates gives you an opportunity to tighten up the tolerances in the LCA. Once those plates are welded on you can't do that!