Sixpac, to answer one of your original questions, the paint store is not putting you on. Every time a manufacturer develops a line of paint, they have to make available to the jobbers the mixing formulas for all the paint codes that manufacturer chooses to service. That is why so many old codes are not available in modern paint. So Dupont has made your code in single stage (probably Chroma One) but not base coat/clear coat. As for my two cents on the two paint types, I think old vehicles look better in single stage. Single stage paints can be worked to a very high shine. Lay the paint on smoothly, color sand and buff and admire the reflection. Base coat/clear coat paints are typically glossy. The clear will have the wet look no matter how poorly it is laid on. It could have the texture of a basketball and it'll be glossy. I tend to think gloss and shine and different. One more thing, under certain conditions, a clear coat reflects the light in such a way that you can't see the color under it. Look at some modern cars and walk around them. Move you eyes and head around and eventually you'll catch a reflection where you will see only the clear reflecting something around the vehicle but you won't see the color under the clear. Obviously single stage won't do that. These are the knocks against clear. There are far more benefits however. Obviously on a hobby vehicle the choice becomes very personal.
Joe