Yes, a Dart will be lighter. However, you will never replace the cool factor of the Coronet...just something to consider. I had a 69 Charger at one point and replaced it with my current 69 Dart and always kinda regreted it. Would the Dart always be faster cause of the weight advantage? sure. But the B bodys definately are more stylish (my opinion here) and you dont see them as often at the dragstrip. Especially ones that run quick