maybe the timing is out a little ?

sounds like its just cold and i think most old motors do it ,mayeb try putting a timing light on it and check the timing is where it should be ,but if the problem has carryed over with the new carb then it isnt a fueling problem unless your realy unlucky

ide be checking the timing and check the choke out too ,most the time people get rid of them on dvag webers ,thats why mine ran crappy when it was cold