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526 Posts
The whole reason for wide spark plug gaps was to have a longer burn-time with lean fuel mixtures so all of the fuel mixture would be burned. Carbon molecules are farther apart in a lean fuel mixture and with a weaker coil the spark tends to die out causing a lean misfire. So starting in the 70s cars started having a higher coil output with wider spark plug gaps with leaner carbs to prevent lean midfires which would result in higher hydrocarbons.
So with a car like yours a wider gap really isn't needed. A gap .040 is probably a good place to start.
So with a car like yours a wider gap really isn't needed. A gap .040 is probably a good place to start.