How much did a 1957 fuel injected Chevy cost?

There wasn't a fuel-injected Chevrolet offered in 1957. The first fuel-injected production Chevrolet was the 1957 Corvette, but that was a different model line entirely. The fuel-injected Corvette's price varied depending on options but was significantly higher than the standard Corvette. There's no single price figure to give for a "fuel-injected Chevy" in 1957 because it didn't exist as a standard offering across the Chevrolet model range.