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Here is another question. What would happen if I drill out the broken needle then plug complete idle circuit so that the fuel cannot get to the slot or the hole where the needle jet was?

In theory, the center carb should have all the idle circuitry. I can see the outbords providing some idle mixture to avoid leaning out the cylinders furthest from the center carb. But having center carb doing full idle duty wouldn't be any different than having a 383 or 440 with a 2 bbl on it. Though the manifild desing on a dedicated 2bbl engine would be better suited for distribution.





You don't want to do that. The idle circuit on the end carbs is needed. The transition from closed to opening without the idle circuit in them will definitely cause a stumble unless your center carb is way rich. Idle quality is actually better anyway, using all 6 screws to set it.