There are a lot of products out there that do a good job. My '68 has much of it's original paint and I am very careful to maintain it well, as I want to keep it original as long as possible. My best piece of advice is to use the most gentle products possible -- it's better to go over it twice lightly that once with too abrasive a product, as you might not be able to fix it. I've had the car for 19 years now -- it's been professionally detailed twice, and I've just kept it well waxed, going over any trouble spots with a light cleaner when needed. With respect to the stripes, I would mask them off for any work you do with a buffer and very carefully go over them with the a light cleaner/wax, like Meguiar's #6 to blend that area in with the rest of the paint. I use Meguiar's #26 high tech yellow wax, and occasionally Meguiar's cleaner/wax paste in the red container about once a year. My car stays covered in a garage and isn't out much and that works well.
Good luck!
