I would only change the ones that need changing.
Short of a fire the only ones Ive ever replaced were the bottom arms on the tag on my 85 (Needed and worth doing), and the front axle on my 85 that was a complete waste of time because they were very good and still original.
The posts have a shoulder that you bottom the nut out. When undone the bushing releases at that point the arm is very easily removed. The old rubbers can be cut out with a Stanly knife or anything. The new bushings pop in with a block of wood and some WD 40.
They squeeze up tight when you run them up.
The big long one sideways is very heavy.
Worst thing you will encounter is some posts will be very corroded and deteriorated. Be prepaired to either spend a great deal of time cleaning up the posts or replacing them.The posts and the inner surfaces of the arms they will be very bad too at least a few.
If you do not clean up these surfaces they will prematurly destroy the replacement rubbers IMHO
Id take a good look at them and only do the ones that need it.
