What are you using your car for? All out Drag Pack engines will put out comparable (probably more) hp than a stock hellcat but are nowhere near as street friendly (plus a hellcat is a pulley change away from glorious hp gains). They need gear and converter to work properly. A hellcat will be much more tractable and run better/faster with a combo that’s not optimum. It’s like comparing a 750hp 572 vs a 750 hp 360, both will be similarly fast with optimum set ups but waiver off the optimum and the 572 will stomp the 360 and won’t be such a nervous engine