Well than I suggest you start searching for the absolute best cores you can find, As I mentioned & I'm sure you already know potmetal can be a problem & those taillights are a nightmare.. I've had a few sets all broken down, they aren't the best quality potmetal (if there is such a thing) to begin with & exhaust fumes don't help... Good Luck..

"The Armies of our ancestors were lucky, in that they were not trailed by a second army of pencil pushers."