Dual carb advantage?

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What is the advantage of a dual carb setup on my 8BA I have in my 37 pickup? I once installed one on my 46 2door sedan and even with the correct power valves did not see much difference. What would be the best setup? I did install a T-5 AND REALLY LOVE IT but still have a small vibration between 51 and59 mph. Before and after there is none. I always appreciate the wealth of knowledge and help I recieve. Thank you, Jim in Orrington Maine.