No Spark help

Well at this point I am stepping away from this and going to need someone more experienced with electrical to take over. Maybe I just am not grasping it but i'm just chasing my tail and nothing seems to make a difference.

I don't understand how the car ran with no issues until we put this motor in. Nothing electrical was messed with inside the engine bay or under the dash.

I completely pulled the bulkhead plugs and went through each one and cleaned the crap out of the connectors just to make sure I have a solid connection.

Still drop volts like crazy when the lights are on. Electrical is not my cup of tea and I think I am just getting myself messed up with all the diagrams and lack of knowledge/experience.