1970 C/10 Electrical Issues

[etravis46]

Ok. So I usually try to answer all my questions by researching past threads and searching the internet but I can't seem to find any info that can help me. I have a 1970 C/10 CST longbed. I bought it in Feb and it had a V8 with a two barrel on it. Manual steering and manual brakes. I checked the Serial on the engine and I believe it is a '73. So I am pretty sure someone has swapped engines in the past. I found a 75 c10 for 300 bucks and pulled the engine, rotors, and power steering off of it. I have already finished the disc brake conversion and added power brakes as well as the power steering.

Then I get to the engine swap. The '75 has been rebuilt fairly recently and has an Edelbrock carb with electric choke and an HEI. The old engine that was in my '70 had a points system and and externally regulated alternator. So I start tearing into things and all goes smoothly until I realize I have some wires that I can't remember what they go to. I've checked all of the diagrams I can find and can't seem to make sense of them.

So my first question is what is this connection block called in the first picture and does it do anything or just serve as a junction point.

Second question is does anyone recognize this black plug connector. It goes to the flat connector that has the black and blue wire. I originally thought the black and blue wires went to my alternator because it fits the slot but after researching I just don't know.

Since I am asking questions, I'll also ask if anyone recognizes the large pink wire in the third picture. I believe it goes all the way back to the ignition switch.

I know electrical questions are tough because colors fade and/or have been changed in the last 40 yrs by who knows who but I hope someone can help me out! Thanks!