The orange one is non-EGR, EGR = Exhaust Gas Recirculation, viewed from the front to the right of the carb flange is two passages & two bolt holes, one passage is exhaust from the crossover passage, the other feeds both planes of the intake through holes below the carb...

Those manifolds are speadbore design & accept a Carter Thermoquad or a Rochester Quadrajet... Both carbs were used by Chrysler but the Thermoquad is much more common & when setup correctly is a great carb...