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The wiring for a 1974 Pontiac 400 engine typically includes a main harness connecting the ignition system, starter, and alternator, along with several smaller harnesses for components like the distributor, coil, and sensors. Key connections involve the ignition switch, battery, and various grounds. Additionally, this engine may have wiring for accessories like the oil pressure sender and temperature gauge. It's important to refer to a specific wiring diagram for detailed connections, as variations may exist based on the vehicle's configuration.

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