For engines equipped with a distributor-based ignition system, the initial timing advance is typically set between 0 and 10 degrees Before Top Dead Center (BTDC). This value may need to be adjusted to optimize performance and ensure proper engine operation.
For engines with Electronic Fuel Injection (EFI), the timing advance is controlled by the Engine Control Unit (ECU) based on various sensor inputs such as engine speed and load. The ECU will adjust the timing advance to maximize performance and efficiency while minimizing emissions.
It's important to refer to the manufacturer's specifications or consult with a qualified mechanic to determine the correct advance for your specific Chevy 350 engine.