Welcome aboard! I was in a similar situation with my car. When I got it, parts of it were about the same color as your car with a really horrible color brown/tan interior and it had had a vinyl roof as well. I knew that I wanted to change the color of the interior to black so I needed to decide on a new exterior color. I finally decided on an exterior color and then I couldn't decide if I wanted the vinyl top back on or not. At a big Mopar show a few years back, I saw a 70 that was about the same color that I wanted to paint mine, but without the vinyl. The bright color was way too much!!! So I decided I needed the vinyl top (black) to tone down the color. If you are considering a darker color, probably don't need to replace the top. If you are going with a brighter color, you might want to consider how it would look both with and without one. The beauty of the internet is that you could do an image search for 70/71 Darts and probably get a bazillion hits with all different color combinations that might help you narrow down your options. Good luck. L8r
Jim