Nothing wrong with the Edelbrock carbs, you just don't have the linkage hooked up correctly. you would think Mancini would include a diagram showing the proper attachment hole on the front carb lever, since they are not the same as the original Carters, you cant use the FSM and I am not sure the Ebrock site would show it as they have their own linkage, not the same. I run a pair of the 800 AFB's on my Hemi and they work very well once the jetting and rods were optimized.