Stop in for a cup of coffee

so i figured out the rear valence i have for my dart is twisted just a bit. Been trying to figure out how my quarters and the tail panel and everything else was square, any way it was measured. but when i put the valence on, it looked like the right side was higher than the left. So i finally took it, measured the valence for squareness and its out 1/2 an inch or better. and in a weird twist that I lack the skills or knowledge to correct. So time to get a different one
Do you have matched wheels tires, correctly and evenly inflated? Then park on flat surface and measure various points from ground. First making sure suspension and then frame points are equal from ground on each side.