Update! The battery finally measured as fully charged on the tender. I left it off over night and she turned over this evening perfectly! Will keep an eye on it but I think it was just a drained battery - much have been that way when we got her. I think the many suggestions to better ground the cable is a really good idea. So I will look into doing that!
In other news, I think I’m finally getting the hang of driving her! The gears are so touchy and it’s easy to grind when trying to shift from 3rd to 2nd… my husband who has a class A license suggested to give her a bit of gas with the clutch in to get the rpm’s up to the proper spot and then shift down (that’s what they have to do in the big rigs)… and it works great. Smooth as silk! Any other suggestions to make sure I’m not putting any undue pressure on the clutch or transmission are greatly appreciated! I’m hoping these old cars are a bit forgiving while I learn their ways! And question… sometimes when starting out of the garage, she doesn’t want to go into reverse or 1st, even after going back and forth from 2nd and 3rd. So I finally had to just go for it and it grinded a little before going into gear. How do I avoid that?