Power steering.- Can you tighten up?

Will the gear box have more play in it with no fluid going thru it ?

What an odd question. Can you elaborate?

Open the hood, engine off,reach down and grab that coupler thingy. Rock it back and forth. Notice how far the worm shaft crawls up out of the box. This is one form of play.
Next notice how far the worm shaft rotates before the sector shaft moves. This is another form of play.
Next, jack one front tire off the ground. Grab the tire at 3 an 9 o'clock, and attempt to turn it left ,then right. That is another form of play.
Next grab the tire at 12 and 6 o'clock, and attempt to **** it by pushing and pulling the top of the tire. This is another form of play.
Next jack the one side up under the LCA, until the tire is about 1.5 inches off the ground. Then lever the tire up and let it drop back down. Hyup,another form of play
Each of these different forms of play requires a different solution.

And I agree that these cars are over-boosted. However, too much toe-in, or too much toe-out, will make your driving experience miserable.
The sector shaft play gets tightened up by the pump-pressure. It can be quite loose with the engine off,before it gets aggravating.
The in and out play of the worm shaft is the biggest PITA, and also the hardest to reduce. But when you tighten that up, well now, that is something!When you mod the reaction springs, this delays the onset of boost, making driving in a straight line, a lot easier. And yes it will require more energy from the operator to initiate a turn. The more springs you add, the stiffer the feel. I can't recall how many I added but I do recall that on the first attempt, it wasn't enough. It mightabin 3 discs, or maybe 4 that I added.Chrysler used to sell a kit with quite a few discs in it.