PCV and Breather suggestions

you 100% need to move that PCV line, any manifold proper size vacuum port will do. I just talked to a buddy who has a 440-6 car and he mentioned that exact location depended on year, that would only matter if you are going restoration look. You should be looking at the back of the carbs or to the low side of the middle carb. it will be on the same side as the PCV.
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Original setups with the bowl vents like the OP were for the evaporative control system (ECS) equiped cars.
To make that operational I think that requires the three nipple breather (shown in your other photos). Otherwise treat like a standard carb vented into the aircleaner.
More pictures here: https://board.moparts.org/ubbthread...a-carb-hose-routing-question.html#Post2536445