Just an FYI.
When using the NADA price guide, you can't add 30% for the SS option to a car that already has it figured into the base price guide.
Your link starts with a base car:
Muscle Car 1969 Chevrolet Chevelle Super Sport 2 Door Sport Coupe (396)
Therefore, your addition of the SS option would yield a result inflated by 30%.
Not debating your pricing or the car, only your NADA estimate. Personally, I love unrestored cars.
The price was certainly right.
Blair