Billy, I think the first two screws are: idle speed setting, and choke fast idle cam setting.
The screws in the third, fourth and fifth pictures are: the idle mixture settings. I usually set them at about 1&1/2 turns out and then adjust each one after that with the motor running and warm, until the motor smoothes out the most.
Yes, block off the unused vacuum ports, but make sure you use the right ports and block the others. I don't like the hose coming out of the side of your carb, as it might go to your vacuum advance and that doesn't look good to me. Tomorrow I'll look at some Carters and see where the vacuum lines come from.