Thanks Bartamos. The Napa listing for that starter switch calls it a "starter solenoid switch" so that's where I got the name from. It's stuck with me cause of how silly it is.
https://www.napaonline.com/en/p/ECHST11Probably won't matter if I got a GM alternator, but on some you do need a wire hooked into the "start" because it needs initial power, not sure why, just know it's gotta be that way. But ya usually a GM alternator is just about the easier thing to wire in the world.
I've been in contact with Kenneth. Issue is my starter is a refurb and whoever did that removed the original stud and has put in a new one that screws in and out. I gotta get back out and pull the starter out so I can get pictures to him to make sure what he's got will work. But man that starter is probably the best one on any vehicle I got. Gonna make sure to keep it, runs really well.