I can't fix this really sweet '73 Buick Centurion! What's wrong with it & why can't I do the repair?

This beautiful green giant has the CAR WIZARD 🧙‍♂️ in a pickle! He can't fix it! Ironically, the owner has even named the car "Pickles". Why can't he fix this 1973 Buick Centurion with the Buick Big Block 455?
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