Bogging on one barrel

Timing should be checked and check whether the choke is opening after the engine warms up. It may be time for a carb rebuild.

I'd go with checking choke too,

Car rebuilt. At idle fine in netral it revs clean. As soon as I take off line bogs out unless I feather gas.hard pedal some dark smoke.

Running rich causes black smoke but the bogging could be a bad accelerator pump.

Agreed.