* Engine condition: Worn components, carbon buildup, and other factors will influence optimal timing.
* Fuel quality: The type of fuel used can slightly alter the ideal timing.
* Altitude: Higher altitudes require slightly different timing.
* Modifications: Any engine modifications (intake, exhaust, etc.) will necessitate adjustments to the timing.
Instead of a specific number, you need to consult your owner's manual or a reputable repair manual specific to your 1988 Camaro 2.8L V6. These manuals will provide the *base* timing specification, which is usually a starting point. From there, you might need to fine-tune it using a timing light and following the procedures outlined in the manual. Improper timing can severely damage your engine.
Warning: Adjusting the timing incorrectly can cause serious engine damage. If you're not comfortable performing this task, take your vehicle to a qualified mechanic.