4 door mopar cars

You are probably watching, DDSpeedShop is building a 2 door biscayne,big block. If you arent, may want to go look.
He has done a pile of tri-5 chevys. He starts by comparing roof lines between 2 and 4 doors. Somewhat of a hack but gets the job done.
I have never heard of DDSpeedShop. They idea came to me about 40 years ago.