Starter Relay Wiring

I apologize for taking a little while to respond, I've been away from home for a bit.
I was told this car was driven somewhat "regularly" on the street when the weather was good, which is what I intend to keep it as, wanting a hopped-up street-strip car.
The alternator does have the 3 wires (blue, green, black).
For the ignition setup there's an MSD 6AL box and an MSD Blaster SS coil. Also, a fuel cell/pump in the trunk. To start the car you gotta throw the ignition and fuel pump toggle switches he installed then turn the key on the column.
As for how badly the wiring is on the inside, everything looks to be there and hooked up, just leaving everything on the outside of the firewall to be the area where the wires are either wired wrong or not wired at all. Also, do all of the "slots" in the bulkheads connectors have wires coming from them or are there just a generic amount and used only as necessary leaving some unused?