I have googled this, but the MC2100 changed/added port locations throughout the years it was used. Below is the way I plan to route the vacuum lines. Please let me know if something is not correct or I totally missed a line. The color code refers to the color of vacuum cap. I tried to make this as easy to follow as possible.
Red (Pic 1)- crank case breather. I plan to use a Fram BA6592.
Black (Pic 1)- PCV valve
Blue (Pic 2)- distributor
Red with hot pink line (Pic 2)- to charcoal canister port closest to the firewall.
Black with pink dot (Pic 2, look for pink dot at the base of carb)- CTO port #1 shown in Pic 4.
Blue (Pic 3)- CTO ports #2 & 3(Pic 4) should be connected with a tee and connected to this port.
Black (Pic 3)- Brake booster
Red (Pic 3)- I am not sure about this port. Does it just need a cap?
Port #4 (Pic 4)- connects to charcoal canister closest to front bumper of Jeep.