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all kinds of good info here, and the accumulation of problems.. One other is the distributor has worn where the points contact it. This can also be checked but it's tedious.. If you plan on changing distributors anyway, do it now and try it. Also, The easiest way to check this problem is put the distributor on a distributor machine.
I do have a tendency to "agree" on the timing chain. The factory gears have a nylon coating on them. it's very thick and when it starts to wear it breaks. That would/could be your irratic timing.
You have a few choices, Depends on what you are after. If you want it quiet, and the motor is stock, You can just replace the gears and chain with a factory one. the noise is why the factory went with the Nylon coverage. If the noise isn't an issue with you, I would go to a single or double roller timing set. they are all metal, they can stretch but no wear. Then you have a Steel GEAR set, Mine is Pete Jackson, They are noisy as all hell... They do make a quiet one, But I have never heard it. These are as accurate as you'll get. your timing will stay Rock solid as far as the Gear is concerned. The last and most expensive, is a rubber belt chain set up. I have known guys that run them, but they are very expensive.
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