1957 Chevy Belair 4-door garaged for 30 years

I am selling my 1957 Chevy Belair that I purchased from an individual in Ohio that bought a farmstead at an estate sale and this car was included. He contacted family members to see if anyone remembers any history and they said they remember their dad changing it from a six to an eight cylinder with headersquite a few years back. This car appears to be all original except for the swapping of engines and transmissions. The odometer show88,200 miles and believe it to be actual.The original 6 cylinder and powerglide transmission is available for sale for an additional price if interested in that. I have someonethat wants to pretty bad but told them I would give the person who bought the car first chance. Contact me via Ebay if you have any questions.