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Since leaded fuel is no longer readily available at most all gas stations, you may have to use an additive.

Proper leaded fuel is a little bit better for your engine than non-leaded additives, but hard to get and quite expensive. An additive like Tetraboost adds the lead to unleaded gasoline with lead-scavengers. All vehicles sold in the US from 1971 on are made to run on unleaded gasoline, so there is no need for an additive in your 78 unless you have an older unconverted engine in it. It should run fine on very low octane fuel.

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15y ago
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Q: Should you use leaded or unleaded gas in a 1978 Chevy Scottsdale 350 5.7 liter?
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