If you were building a Mopar sleeper....

4 door dart look up a thread that had 4 door pictures There were some reall nice ones. You can easily do a 400hp motor and keep it quiet. Just need quiet Mufflers and a X pipe. 340 Manifolds or shortys. RHS are Iron so you can paint them the same color as the motor and no one would ever know. 650-750 vac sec and a cam in the 230@ 50 possibly