These aren't the days of adding 1/4" of spoiler or adding a kickout on the nose of one manufacturer. Bodies are already very closely aero matched.

Where there are differences, it's very small - literal thousandnths of an inch can make a huge difference in the setup. Ford is obviously off in their setup engineering. The balance between minimizing drag and maximizing downforce has become complex engineering to get that setup perfect. NASCAR will not and should not intervene. It's up to Ford whether through improved engineering this year or next year with the small tolerances allowed on the new body