I've pretty much maintained my GTX towards the stock side. I do have an 800 Edelbrock carb on it to replace the 650 AVS that was on it when I bought it and added linkage to work the choke as a divorced system. I also installed a 2-1/2 inch TTI system with their supplied Dynomax turbo mufflers. If anything it's too quiet to me, but probably is a good overall compromise. I also re-worked my Mopar distributor to build in a custom advance curve to allow a bit more initial timing. I figure that helps the stock engine breath and exhaust as freely as possible while maintaining the good engine manners of a stock engine. Lately I have ventured a bit from stock with a 3.55 rear and a bit looser torque converter since I don't spend much time on highways.
My one time experiment many, many years ago with a hotter cam in a stock 383 hi-po ended unsatisfactorily for me. It hurt low end performance and the small valve heads couldn't take advantage of the additional duration and lift. My car is full power with AC, heavy and no racer, so it needs to stay with a stock cam and intake. But, it still moves out pretty strong for what it is, in it's present configuration and idles quietly and smoothly.
