Wiring help needed

Hello everyone,
I'm in the home stretch with my 383 project, and now tackling the wiring harness.
I've painstakenly removed, bagged and tagged several electrical items that will not be needed; fuel pacer, all EGR related equipment, etc.
I have been looking through my 1975 FSM like a madman. It's been taking me some time to fully grasp the wiring diagram I'm not ashamed to say. The harness is the original Slant 6 unit. With the big block swap, all I really needed to do was shorten some of the wiring to: Alternator, Coil, Distributor, Voltage regulator, Temp Sensor.
I'm planning on replacing main alternator wire with 10 gauge wire in preparation for higher than the stock 225 unit presently in the car. (No, I don't want to purchase a Powermaster alternator just yet)
I've been using Pico brand materials MADE IN USA, when possible. I used their butt joint crimp and heat shrink glue connectors that are amazing! I did a test on scrap wire - you can not pull these apart! I will be installing a Tach, Temp, and Oil gauges, so I will route wires in the harness neatly and tap into the fuse box - which seems much tougher on this A body than my 68 RR! The fuse box seems sealed? I was going to run a busbar inside the car under dash for power, lights, and ground for the gauges. In the old days, I would just tap into ashtray light for lights for gauges....
I really want to do this right, and I am open to suggestions, recommendations!
Where are the Forabodiesonly electrical gurus? Del - you out there?
Here's a pic of my mess, LOL
Scamp wiring mess.JPG