Duster/Demon body line

I have noticed that the center quarter panel body line is virtually straight on some cars and on others there is a slight upward curve above the wheel well. My NOS quarters have a slight curve. The AMD quarters look pretty straight in the pictures.

700-1372-R.jpg fcf93d5f-02d5-49a9-b696-39356b663dac.jpg If someone has an original paint car, I would be interested in knowing if that line is straight or curved. Thanks!