I still lean toward an electrical issue. When running above an idle and if the ignition is shut down manually or by a problem the engine will continue to suck in raw fuel and it'll stay there until it is started back up causing the black smoke. The faster the engine was running when it died the more unburnt fuel you're going to have in there to clean out next time it starts. Do you have an electric/mechanical fuel pump installed on this or is it still gravity feed?
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