340 fuel issue stalling or excessive crank

Flooding, and running rich all the time. See how black it is?
yeah i saw that wasn't sure if that was a result of the possible flooding boiling issue. where should i start 1st? should i block the crossover like recommended? i checked my vent tube clearance and its good but likely could be better. what is the ideal conditions and way to properly adjust the carb/ in your experience?
thx joe