I agree with NM51....I fought with a worn out Rochester, bought an Azone rebuilt...it was in worse shape than my old one. The Holley/Weber is absolutely great...right out of the box!!! More power, smoother idle, better mileage and no more gas fumes.
However, I had a friend who removed the Rochester throttle shaft, drilled a shallow hole on each side of the base....found an "O" ring that fit snuggly on the throttle shaft and then used epoxy glue to hold a little cover plate that kept the rings from popping out. Used double gaskets on the top horn, reset his float level.....it still ran like crap but at least it didn't leak out the side.....just into the intake.
Be happy...go with the Holley/Weber!!!!