Tail lights and cluster light wont come on?

I have to think you've pulled a wire off a unseen terminal. I would put the fuse box down and lift the back cover. There are a bunch of wires in there. Fewer on the buss bar side. Maybe one of those pulled off, Like a short one that goes almost directly from headlight switch to fuse box.
I no longer have a 73 here to look at so I'm only guessing