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A 300 6 cylinder is a truck engine, not used in a mustang. If you have points you can check your air gap 2 ways, (1) If you have access to a dwell meter you can check the gap with the engine runing. (2) Slide a feeler gage between the contacts, making sure you have the right size gage.

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17y ago
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Q: How do you check the points on 1969 ford mustang 300 straight 6?
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