The Impala is about Chevelle size. How expensive would it be to reskin the car with a retro Chevelle look. A model change is due anyway. The floor pan would need to be modified for the drivetrain and you could even keep the independent rear suspension. Turn the engine to a fore-aft setup and you have it using most of what you already have. It's not like a whole new car would have to be developed.
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Chevelleless after 46 years......but we did find a low mileage, six speed, silver 2005 Corvette. It will just have to do for now.