I just bought a 1973 Mustang. Every thing thats been done to the car was by the guy i bought it from. The car was made with 351c 2v intake manifold, now it has a 4v. It has Headers, MSD Ignition with new plug wires, Edelbrock manifold, a 670cfm Avenger Double pumper carb. The firing order is right. All vacuum lines are new,(when) I can keep it running, it runs very rough. My question is, too much Carburetor or not enough Fuel? or could it be some thing else? any help would be great.