More EZ wiring replacement questions.

[PUSHER]

I'm going to try another post since my one from a couple days ago was a pretty poor one. I have a 1976 280z that I'm in the process of installing an 18 circuit ez wiring harness into with the original oem harness already installed. I'm at the stage of figuring out what is replaced by the ez wiring harness/fusebox and what needs to stay on the car to function. I'm trying to pull out the old harness off the front half of the car but it seems like its going to require some cutting and not simply unplugging some stuff and wiggling it out. Anyways some questions:

 

1) Transistor Ign box.

2) Some kind of vacuum control unit under the hood on the pass side near the strut tower.

 

I'm assuming I need to keep these thing but how? Where do they run to/ are they easily removable from the oem harness. I appreciate your time and I'm sure I'll have a lot more questions as I try to figure out how a 30 year old car works. Anybody who has been through this with AIM or wouldn't mind being PMed with additional questions, It'd help a lot.