I don't think the dual 3 1/2" speakers will sound a whole lot better than a single larger one, but the nice thing is you will hear everything that was meant to be heard, just not in true stereo. If you keep a single, you would have to hook up just the left or the right, so the dual is a great way to go & keep it looking factory, & hear everything.
68ragtop
1968 GTO Convertible (currently my resto project)
1978 Gold Edition Trans am
1979 10th aniversary T/A
1980 Pace Car Trans am