Slicks with stock spring location? (I know I'm crazy)

If everything is perfect (backspacing, axle housing location, spring location, bodywork) you can get a 235 tire on it. 9" or just slightly bigger sidewall width. I hope your wheels have around 4 7/8" backspacing.

By the way, you can't compare a 'cuda to a Dart. The bodies are too different.