Is your car original I need help ?

Original or near original 1970-73 dodge dart or scamp....Could someone get me the measurement from the frame out to the very bottom of the quarter? ( there is a slight bend there I believe on the quarter). Both near the wheel well and back in front of or off the rear shackle box. I'm in the process of replacing my wheel wells ,trunk and trunk extensions. I need to know/have the propper curviture of the rear quarter which I can set when I weld in the trunk extension with the bottom of the quarter. Both front and back please as the rear lower valance has to fit also. Any help will be greatly appreciated thanks!