https://anghelrestorations.com/. Strongly recommend Marcus if you are in a position to have a ‘67-70 Mustang concours restored. He’ll interview you as hard as you’re interviewing him. He wants collaborative partners with a common goal. Great info on his site, he shares a lot of information he’s collected. If you’ve ever come across that exhaustive paper on decoding the dates on Goodyear Polyglas tires, that’s him.