Sorry about not getting back to you sooner. I have been doing a lot of research on the Adcocks. They are difficuklt. I have discovered why!
Lewis Adcock and his brother Wilson moved to Blount County, AL after the Civil War. They are probably relatefd to your Mary Ann from Powder Springs. Lweis changed his name to Leven because of a shooting incident in which he killed a carpertbagger.
He and his wife Rebecca Broiwn were Cherokee Indian. This is not easily proven but from what I have determined is why they are difficult to follow. Do you have any more information?