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Spark plug recommendation

Fuel System

Vehicle Information: Model: 911S; Year: 1973; Body Type: Targa; Engine (type, size, modifications): Stock ignition and fuel system, except for Pertronix; Total Mileage: Approx. 100K;

I have heard many opinions about using the factory recommended Bosch W3DPO's in my '73S, ranging from "use no other plug" to "they have always been too cold and too expensive." So far, I have been using the W3DPO's, and they do get fairly sooty even though the car is roughly within emissions specs. I would be curious to hear your opinion about which plugs to run in an essentially stock '73S. Thanks.

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