You can get 18-19+ out of all of them. All factors being equal. As far as the 350, it depends on year and HP. The 1970 would be pre emissions and would probably get good mileage. But a rat rod is a hot rod and hot rodders don't get good mileage except with their right foot. If you are a "smoothie" Hot Rodder, you will be OK. EFI does not give mileage. The wrong carb/adjustment/brand= BAD mileage.


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