Hey AZM, would love to see some pics of the car. The "fastback" was first introduced in 1963 1/2 and was the first "half-year" model introduced by a car company. The new roof style got its origins from NASCAR and Ford decided to include it for there production models. Is the car an automatic or stick? Buckets seats with console or bench? The "XL" also adds value to the car. Unless it's a factory "R" code 427, it may never be a huge collector car but as a '63 Galaxie 500XL fastback, it's no ordinary car either.
Welcome to CHR!