Old man with old car, new here with questions

That looks like a neat old car! If I were you I would definitely be using jack stands! You can never be too careful!
Absolutely. Just FYI, the blocks you see are all screwed together in opposite directions so that on top the wheels sit inside the supports. Some people call them cribs. They actually give better support and lock the wheels in place. I also have jacks under the front and rear of the car but they are hard to see. Then before I go under I also use a hydraulic jack under the rear end. It's too easy to make mistakes as we get older so we need to believe that we are prone to accidents. Also FYI I did not use the ramp in the back. But I do appreciate the reminder to stay safe.