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Two hoppers facing each other. 42 items in one hopper 1. Piston switch to push rs block from one hopper to another. Input signal toggles the switch, pushing rs block, starting hopper 1, disabling hopper 2. Hopper 1 takes 168 rs ticks to push 42 items to another hopper. Once comparator out of 1 reads 0 it produces output signal and activates another switch that will generate output next time hopper 2 is empty.
Next time there is input signal, it toggles input switch again, reversing flow of items and output is produced when hopper 2 reads empty.