HEI Extra pigtail?

[Solver]

I recently picked up this HEI for my 72 350 but it has an extra wire pigtail shown in picture on left side. Can I use this HEI on our trucks and if so what is done with the extra wires (IE what do they do or what won't they do if not hooked up)?

[Suicide-D]

looks like the ESC distributor in my 84 Jimmy... Electronic Spark Control... I'm not sure if it is necessary or not.

[Piston]

Yep its for ESC and without the ESC module connected, the ignition will not fire. You can replace the ignition module with a regular 4 pin and just remove the ESC wiring.

You can also jumper 2 of the wires to bypass the ESC control but I dont remember which ones right off hand. I can look into it if you need me to.

[Solver]

Ok I tried switching the modules but that doesn't appear to work as the new 4 pin module has only 2 pins going to the esc area (1 large 1 small) and the original ESC module has 3 pins (all small) so they don't go into socket. Tried removing the whole pigtail (socket and wires ) for ESC but the other end goes down into the distributer housing and is mounted to clip or ring inside there.(RED ARROW) I dont think I can just pull wires out. Any Suggestions? I surely can't be the only one who has made this mistake of getting to new of a distributer. thanks again