Questions on wiring Ignition/ supplying power to the fuse box

Hello everyone,

I have been redoing the wiring in my 1968 Dodge dart and had a bunch of questions. I bought an EZ wiring harness kit because the harness in the car now was incomplete. The previous owner has wired in their own ignition switches to bypass the keys, and had done a few other things that left quite a few cut wires.

My big question is how to hook up the ignition:
To be able to start the car with a stock ignition switch, how would I need to draw the power through the relay into the harness to use the ignition wire in the new harness? I have an alternator power line and a solenoid power line on the new harness, but nothing that seems to hook to the battery directly. The alternator power goes to the new fuse block, so currently the power that use to run from the alternator into the cab via the black wire in the second picture now goes nowhere, and I am not sure if I need to splice it into the new harness ignition wire to get power (It powers accessories and lights via the light switch, i planned to wire all of these with the new harness wires).

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The previous wiring had direct power going to the ignition switch which would make the connection to the solenoid, in the wiring diagram im looking at, it seems this is normally drawn from the alternator via the black wire in the harness below.

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The new ignition switch has the power coming in from the new wiring harness (red wire), this is where I was thinking I needed to add in the connection from the battery terminal on the ignition relay - unless the harness is getting power from somewhere else.
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From there, I planned on piggy-backing off of the direct ignition wiring (red wire above) to power the light switch below via the Black TR (black with white line) wire.
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Does this make sense? I feel like the wiring harness and diagrams show the power being drawn from the alternator for everything except the starter, but I am not sure how to connect all of the new wiring with the old wiring when it is all spliced together.

Thanks for your time