Here's a link to a nice article about John Chun and his history with designing GT-350-500's.
https://www.roadandtrack.com/car-culture/a27376687/the-north-korean-designer-responsible-for-the-1967-shelby-gt500/
https://www.roadandtrack.com/car-culture/a27376687/the-north-korean-designer-responsible-for-the-1967-shelby-gt500/