How do you check ignition timing on 3.8 mustang?

To check the ignition timing on a 3.8 Mustang, first, ensure the engine is at operating temperature and the timing connector is unplugged. Use a timing light, connecting it to the battery and the number one spark plug wire. With the engine running, aim the timing light at the crankshaft pulley and align the timing mark with the appropriate timing specification, typically found on the emission label or in the service manual. If adjustments are needed, loosen the distributor hold-down bolt and rotate the distributor until the timing is correct, then retighten the bolt.