By 1971 the muscle car era was already cooling off, and Buick’s Gran Sport had to adapt to new fuel and emissions realities without losing its identity. This GS 350 survived that transition looking sharp, one of a shrinking number left from a production run that barely broke nine thousand cars. Here is what made the 1971 GS a genuinely interesting footnote in Buick’s performance history, not just a leftover from better years.