Engine swaps make the world a better place -- there’s no question about that. Have an old Mazda Miata and want to go fast? Easy! Slap a V8 under the hood and you’ve solved your performance problem.

Based in Yonkers, New York, the Keep Gunnin' garage, which features a lift, a few toolboxes, a stash of new and used parts of unknown quantities, and just two employees, isn't open to the public and ...