I recommend using only Holley brand rebuild kits. That carb has been rebuilt with a non-Holley brand kit (visible by the lock nuts used for the needle and seat), the main problem is the other brand kits use a jam nut to secure the needle and seat that will eventually pull the threads out of the bowl causing it to be worthless. The original Holley system uses a floating nut with a lock screw on top that doesn't use the threads to lock everything down.
Berryman's makes a great carb dip. The main body of the carb will not fit into the 1 gallon can, but you can soak it in the bottom of a bucket and then pour the cleaner back into the original container when done.