Engine miss when using power brake

Thanks Dan. I did move it to the carb because the carb on mine did have an extra port that was blocked off. It did run better when I hit the brakes but it did not feel the same and it is in the shop so I don't know if the booster actually worked but I am sure the problem is the booster as you said. It did seem logical to me that the plug on the intake manifold was where it should be connected. So are you sure it is from a 73-75. I will have to check it and replace it.