* Engine modifications: Cam type, carburetor/fuel injection setup, compression ratio, and exhaust system all significantly impact ideal timing. A stock engine will have different timing than one with performance modifications.
* Fuel type: The octane rating of the fuel affects how much advance is safe.
* Engine condition: Worn components can require timing adjustments.
Instead of a specific number, you should consult your owner's manual or a reputable Chevrolet repair manual for your specific engine code and configuration. The manual will likely specify a *base timing* and a procedure for setting the total timing using a timing light. This procedure usually involves adjusting the distributor to achieve the correct total advance at a specific RPM.
Without knowing the specifics of your engine setup, any timing value I provide would be a guess and potentially damaging to your engine. Incorrect timing can lead to detonation (knocking), poor performance, and even engine damage.
