Looking for some advice on which carb will work best on my 87 YJ 4.2. Was considering Weber K551-38. YJ has a fresh rebuilt motor- balanced, shaved head, slightly larger cam. I have also done away with ALL emissons crap, and done the nutter bypass. YJ still not running well. I'm hoping that a new carb will help. I've heard that the Weber carb with a fuel pressure regulator is a good way to go, but not talked with anyone who has done it. Also considering HEI upgrade. Any suggestions would be appreciated.