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

My Gs. So I finally got all the parts, even bought a rebuilt LCA off eBay with sway bar tabs and I was gtg and then this dumb **** won't come off! I took an impact wrench and got it loose to near the edge and the bolt and the nut just spins... wtf! Really hoped I can finish this today.

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