How you check the timing in a 1978 Chevrolet G20 292 engine?

To check the timing in a 1978 Chevrolet G20 with a 292 engine, first ensure the engine is running at operating temperature. Then, connect a timing light to the number one spark plug wire and point it at the timing marks on the harmonic balancer. With the engine idling, check the timing mark against the specified timing setting for your engine. Adjust the timing by loosening the distributor hold-down bolt and rotating the distributor until the correct timing is achieved, then retighten the bolt.