SRT/4 motor in my '65 Valiant?

The Caliber SRT4 motor has variable valve timing which gives it torque at low rpm. Stage II will get you to 400 HP. I don't know what transmission would bolt up to it for rear wheel drive though. The stock Getrag six speed is available in an all wheel drive version. That would be a whole lot of time and work compared to a standard small block that could make the same HP.