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,
Black smoke is a rich condition, so make sure the choke is open as suggested above, also when it is running at idle look down the venturi and see if there is fuel dripping out of the main jet, if it is then for sure it's time for an overhaul. Plus if it has never been refitted with the newer kit of this garbage they call fuel now would be a good time to have it done, and you should think about changing all the rubber fuel lines to the new multi-fuel hoses so you don't ruin your carb rebuild.
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.
If the carb has been rebuilt then it's not right, there should not be any black smoke even under acceleration.
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