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911 Spark Plug

Engine

Vehicle Information: Model: 911sc; Year: 1974; Body Type: Coupe; Total Mileage: 189900;

Regarding my 74' 2.7 engine stock, what brand of spark plug would you recomend and the gap size? ~ also if I would up grade my ignition system to a MSD would I keep the same spark plug & gap?

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