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You could just do it by ear, I never used a timing light. If you've spent enough time around the car you know when you're good and when you're not.

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I have fixed more chebbys with a timeing light and vac gauge because they were set by ear

few mopars as well,not knocking it,i do it myself and then check it with a light to see how close it is.

the light does not lie and it is allways too far advanced have been my results