carpet install

Ok need some info, I am putting new carpet in my 72 dart and I need to know if the carpet goes over the top of the door pinch weld or if it is cut off flush with the top of the pinchweld. I currently have it over the pinch weld but it seems to have the Sill plate up too high to the point that the Sill plate extensions will not line up.
Thanks for any tips or advice