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Rough running until warm can be several things, from distributor being worn, so check the shaft play there, choke not coming off properly, carboned up crossover in the intake manifold under the carb, and as you said, the carb itself. Make sure all the linkage is functioning properly, might even pull the top off when it runs rough, see if the fuel level is high or low, or out of fuel (squirter can give an indication, if it squirts smoothly good, if not, carb rebuild), and running good after she warms up, still looks like carb issue, possible fuel pump if it does sputter a bit when warmed up.
Rough running until warm can be several things, from distributor being worn, so check the shaft play there, choke not coming off properly, carboned up crossover in the intake manifold under the carb, and as you said, the carb itself. Make sure all the linkage is functioning properly, might even pull the top off when it runs rough, see if the fuel level is high or low, or out of fuel (squirter can give an indication, if it squirts smoothly good, if not, carb rebuild), and running good after she warms up, still looks like carb issue, possible fuel pump if it does sputter a bit when warmed up.