1. Install the timing light and connect it to the engine's spark plug wire for cylinder number one.
2. Start the engine and let it reach its operating temperature.
3. Disconnect and plug the vacuum advance line on the distributor. This will ensure that the timing is set at the base timing, without the influence of vacuum advance.
4. Using a timing light, align the timing mark on the crankshaft balancer with the "0" mark on the timing scale. If there is no visible timing mark on the balancer, you can create one by using a felt-tip pen or paint to mark the location where the "0" mark should be.
5. While keeping the timing light pointed at the timing mark, slowly rotate the distributor body clockwise or counterclockwise until the timing mark aligns with the desired initial timing setting. The desired initial timing will depend on the specific camshaft and intake manifold combination, but a good starting point is generally between 6 and 12 degrees Before Top Dead Center (BTDC).
6. Tighten the distributor hold-down clamp to secure the distributor in place.
7. Reconnect the vacuum advance line to the distributor.
8. Test drive the vehicle to ensure that the engine is running smoothly and without any signs of detonation or pinging. If necessary, make small adjustments to the ignition timing until you achieve optimal performance and drivability.
Remember, these are just general guidelines, and it's highly recommended to consult with the specific manufacturers of the camshaft, intake manifold, and carburetor for their recommended ignition timing settings. They will be able to provide you with the most accurate and up-to-date information for your specific engine combination.
