Help! How much space gained by rolling fender lips on '70 Dart?

"So, does anyone else know exactly how much space they gained by rolling the fender lips? I saw the pics someone posted... but how much space was gained???"

I am referring to a '70+ Dart, not any other vehicle... My father is building my dart 2,000 miles away, :cheers:so, I am having to make decisions without hands on knowledge #-o... Thanks!