Engine miss when using power brake

JimMac said

I think you are right. I did pick up a used unit and it has been not used for some time. When I hit the brake on the idle it did miss and continued until I removed my foot. Yesterday I did move the connection the carb and it worked O.K. but I think I need to get it checked.

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This is where I would agree on it being a possible booster problem.
You hold the pedal down and have a continuous miss until it is released.

Moving the connection to the carb spread the leak over the rest of the cylinders instead of just that one where it was connected, so it makes sense that it would seem a little better.