Depends, there are levels of those with less knowledge that ask question, no intention of doing anything and then stick the car in a garage. The those slightly higher that do have an intention, but a little bit of common sense meant if they looked a bit deeper at the problem then it would be an...
Unless you live somewhere really how or really cold, get the standard one.
There can be many things affect the running temp, like waterpump, radiator, general crud in the system, fan not kicking in at right speed.
How many times do you turn it over, usually the readings will jump up on each turn, needs about 5 or 6 to get it stable.
I've always wondered if the first one is closer to the real value since you get more heating effect as you go on turning it over.
I'd put new springs and shocks on the back and not worry about the axle.
The look original, and at that age worth replacing. Check the front suspension too for perished joints. New joints and bushes make the car feel like a much better drive.