If you lay a straight edge on the rocker to the quarter panel....does the quarter panel taper back ?

Im talking about the rocker from the front fender to the rear edge of the door, where the qtr attaches.

I have a Dart with original quarters and that's how both sides are, when you lay a straight edge the rocker is flat to the seam, then there is about 1/2 space at the very end of the quarter. I am replacing the lower part of the quarter right behind the door and I want to know if this is how it should be again.

ANY ONE HAVE A DART WITH FACTORY QUARTERS ON IT CAN LET ME KNOW ?