Where is the crankshaft positoning sensor on a Chevy 350 engine?

On a Chevy 350 engine, the crankshaft position sensor is located at the back of the engine, near the oil filter. It is a small, cylindrical sensor with a single wire connector. The sensor is mounted in the engine block and reads the position of the crankshaft as it rotates. This information is used by the engine's computer to control the timing of the ignition and fuel injection systems.