Starting a thread on some planned and unplanned wiring on my 72 as I get going working on it. I just ordered this 18 x 24 wiring diagram for $36, including shipping.  I love working from these really nicely laid out and colored diagrams.  It's an artform!!  I bought one for a 78 Triumph Spitfire that I picked up a few years ago and it's SOOOOOO valuable to have! https://classiccarwiring.com/products/1972-chevy-chevelle-malibu-monte-carlo-color-wiring-diagram?variant=40725685207240