The Volkswagen Beetle was immensely popular in the 1960s and with that in mind, the factory made only minor but important changes to the 1967 models. Improvements included a larger and more powerful 1,493-cc, flat-four engine rated at 53 hp, as well as dual circuit brakes, backup lights, locking door buttons, and perhaps most welcome of all, a new 12-volt electrical system replacing the dated 6-volt system. These factory upgrades carried over to the 1968 model, making this Beetle safer and…