If it's just surface rust, sand it off. If there is pitting then wire wheel, media blast or whatever you have access to. If you use a chemical on it be sure to clean it thoroughly or it will cause you even more problems.
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1964 Chevelle SS,Ls1,T56,DSE 3 front&rear
1964 El Camino
1971 Chevelle SS
1971 Camaro
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