Not really. The critical timing of any engine is the rpm the engine will be running when it is developing full power. So, forget about timing to where it runs best at low idle as that could get you in big trouble when it is under a load with detonation or just lack of power. Put your timing light on it, mark the pulley so you can see the 30 degree mark and top dead center mark. Now, wind that engine up and adjust the timing by turning distributor until the mark is lined up with that 30 degree mark. Then, idle the engine down, take a look and it should be timed close to top dead center, if the distributor is working properly. If it is not, you should repair dist but if is is close, just forget about it. A car is no different, except auto mfgs rarely give you good marks and higher rpm test points so most just time them at low idle. Modern autos are totally different because that computer is reading several inputs for speed, load, detonation etc and the computer then adjusting timing as it is programed to do. I will also add that most any engine will idle better with slightly advanced timing but then the loaded timing will be wrong and starting will be more difficult. The 30 degree advance is for a factory 460 gasoline engine and if that engine has been modified is not necessarily the correct setting, but I assume it is still stock.
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