Engine run on, Don't know what else to try Options

[oakdalecurtis]

76 2.0, 120k miles, all stock engine parts except for Crane Ignition. Engine runs on after shutdown for 3 to 5 seconds. All engine parts working, thermostat, aux air regulator, no vacuum leaks, motor runs beautifully and pulls hard, engine idles after warmup at about 600 rpm. I tried adding a diode to the lead from the alternator to the generator light, that made no difference to stopping the run on after shutdown. Any other ideas to suggest that might fix it? (besides popping the clutch to stop the engine)

[oakdalecurtis]

I removed the dizzy recently to install new trigger points. I did not loosen the adjustment bolt, only removed the hold down bolt to get the distributor out. But that may have altered the timing slightly non the less. I am taking the car in to a very good mechanic next week for it's required smog check, so I will ask him to check the timing before running it for smog. Thank you for your suggested solution.