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It was easy to modify these cars 45 years ago. Install mag wheels, pitch steel wheels. Install chrome valve covers and air cleaner, throw out stock parts, headers...get rid of the manifolds, let's put in a cam and now we found a 26" radiator on a 71 Chrysler at the junk yard. Now, 45 years later, let's.... put it back original....



or, not. There is a small segment that is preserving history by carefully maintaining these cars as they were.
Historical preservation recognizes things change and any work should be done to preserve that evolution.