Is it getting flooded? What about the timing? If the timing is off, starting can be easier or harder. Points/gap ok? Wiring all seated properly?
BTW, have you set the warm up regulator properly? It made a huge difference when I did so. I got good warm idle when I set it correctly at 2.6mm, but I did not get good non-fully-warm idle until I had adjusted hte warm up regulator piston propoerly. I've not adjusted the CO (don't have a meter yet till next week), but found that setting idle per the instructions was sufficient to have a good idle -- along with setting the warm up regulator.
The regulator first needs to be set up so that the piston is even with the top surface as 68F. I've posted on an other thread of how you can do this without taking the regulator off the car. Then set the gap to 2.6mm.
Then set idle and the CO screw to the default position.
Then check timing and readjust idle.
I think then adjust CO and readjust idle. (I've not done this yet).
Then if really needed, adjust the running CO with verboten screw. If you do this, you may have to go back and reset gap to 2.6mm and start back up from there. (I have not done this yet).