Holley fuel bowls

You can swap them over, but of course the center hung bowls will require the use of a dual feed fuel line, because that little aluminum fuel feed tube on the 600's stock bowls won't work with the other bowls. Make sure you get center hung bowls from a vac secondary carb, or else the secondary bowl accelerator pump setup holes will be drilled. You should also install the little vent baffles and if you plan on dragging the car, upgrade to the jetted secondary metering block and install some secondary jet extensions, too. The vent baffles will prevent fuel from spilling into the intake manifold during hard cornering or accelerating, and the secondary jet extensions will prevent the motor from starving during hard acceleration.

P.S. What I never liked about that 600 carb is the lack of main jets in the secondaries, I don't like messing with that metering plate.
The Holley metering block/center hung bowl upgrade kit for the 600 comes with all these little useful details.