Lots of good info & stuff I hadn’t considered. I was kicking around locking this distributor out & getting the newest MSD offering that has timing control, it’s now only around $400, The MSD 6AL Ultra Plus, I can load maps to it set the curve based off RPM & vacuum. By using my dual point distributor, I can still run a tach drive tachometer & leave the factory wiring intact, just disconnect it & if the MSD unit goes out I can hook it back stock & get it back home on the points & not be stranded.

https://www.holley.com/products/ignition/ignition_boxes/street/parts/6523