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What Spark Plug should you use to improve performance when your 92 Caprice 5.0L has 155000 miles on it?

The recommended spark plug for a 1992 Caprice 5.0L with 155,000 miles on it is the ACDelco 41-983 Professional Iridium Spark Plug. This spark plug is designed to improve performance and fuel economy while reducing emissions. It features a double platinum design that provides a longer lifespan and better performance than standard spark plugs. Additionally, the Iridium tip provides improved ignition and fuel efficiency, resulting in better overall performance.