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You can check if it's a mechanical timing issue by bringing the number one cylinder to top dead center and checking the rotor position in the distributor cap.
To find top dead center remove the number one cylinder spark plug and rotate the engine clock wise until you feel air coming out the spark plug hole. It should be close to the alignment mark on the balancer and timing tab. If you don't feel any air remove the valve cover and rotate the crank until both valves are closed and see if the timing marks line up.
It's rare for these motors to have timing chain issues. Below are the timing marks and firing order with cylinder identification.
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Tuesday, April 23rd, 2019 AT 7:06 PM