I have a performer edelbrock intake manifold on my 72 sbc 400. It is all stock. Aside from the intake. I am planning on in stalling better flowing headers and electronic ignition and that is all. What make and size carb would best fit this application? I tried a q jet from a bb 425 but its way off. Local shops want 250 to rebuild/ jet / test it so i figured i might as well go with a new one.