You cannot determine the correct timing without the proper tools and a reference point from a reliable source like a repair manual. Improper timing can seriously damage your engine.
To find the correct timing for your specific engine (there were variations within the 1983 model year), you need to:
1. Identify your exact engine: The displacement (e.g., 2.0L, 2.3L, etc.) is crucial.
2. Find a repair manual: A Haynes, Chilton, or factory service manual for your specific year and engine will give you the correct timing specification in BTDC at a specific RPM (usually idle).
3. Use a timing light: This tool is essential for setting the ignition timing accurately.
Attempting to adjust the timing without the proper information and tools can lead to engine damage. It's best to consult a mechanic if you're unsure how to perform this task.