How do you set timing in 1971 454?

To set the timing on a 1971 Chevrolet 454 engine, first ensure the engine is at TDC (Top Dead Center) on the compression stroke for the number one cylinder. Use a timing light and connect it to the battery and number one spark plug wire. The factory specification for initial timing is typically around 4 to 8 degrees before TDC; adjust the distributor until the timing light shows the correct degree mark on the harmonic balancer. Finally, tighten the distributor hold-down bolt and recheck the timing to ensure it hasn't moved.