Holley 1920 issues

Thank you so much for this information from AJFORMS and nm9stheham I will look the carb over 1st thing to see if the air cleaner is either touching something or blocking something then check the float level I believe I got a gauge with the rebuild kit if I remember correctly as far as the brake booster some thing does not feel rite , I realize the pedal will drop when the engine is started but from previous experience the pedal while running will spring back enough to touch the switch for the lights the same distance as it does when the engine is not running and it is not ?
Plus when it is running and I take it down the drive at a idle it seems like the peddle goes down further then it should and you have to push very hard to get it to come to a good solid complete stop ?
I was told by a old hot rodder that works at a local parts store here to check the rear brake shoe adjustment that they may need to be adjusted snugger to the drums ,that the wheel cylinders may be having to push out to far and causing the lack of peddle and the peddle not springing back enough ?
But thanks gentleman for all the good info at least I have some where to start and maybe I will be able to get the things done to it I want done before the snow hits the ground around here ! My rocker panels are about 4 or 5 inches from the floor and front fenders are not much higher and I live way out in the sticks so I better get busy cause I don't think it will tread snow very good lol.
Thanks Again Allen