Hard to start when cold

Looking at your pics, you have the vacuum line hooked to full manifold vacuum, move it over to the line to the left(looking at the front of the carb) of the pcv hose and plug off the line you just took it off of. Like @dano said, you should be on ported vacuum, not full manifold.
The instructions on this carb does say that the left port is for emission controlled cars however this car isnt emission controlled.