You don't need to guess on color. Unless the car has been completely stripped before a repaint, the underside of the transmission tunnel will have the true color. The other reliable places to find the original color of the car is the body tag and build sheet. I had a good experience taking the code I got off my '66 Dart GT and going to a PPG dealer. I really thought A3 silver was silver, not green. But it matched the paint I found on the underside of the car.