Timing degrees is probably on a sticker under the hood. I'm not sure if the '80 has the pip wire, if so make sure to disconnect it. If it uses a vacuum line instead, disconnect that and plug to adjust timing.
Does this have the vacuum advanced distributor if it does you gotta pull the vacuum line off and plug it set your base timing and then unplug the vacuum line and plug the vacuum line back onto the vacuum advance distributor if I remember correctly.
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