Yeah those lower shock bolts are torqued to 295 and 350 ft lbs, plus the age that they are, makes it almost essential to use an air impact on them. You'd blow a nut trying to do it with just a ratchet. The Expy will probably ride a bit stiffer than stock now with the KYBs on there. But it'll handle better too.
I did drive a few city miles around town with the KYB Strut-Plus assemblies this week. A little stiffer rider, but not in a bad way. Held better in turns. After I settled in on my drive I noticed that my rear view mirror and seat level seemed just a tad off. I first chalked that up to the guys at the shop adjusting the seat and mirrors for the test drive after they installed them and did the re-alignment.
Before I had them installed, I took a measurement of the rear shocks from the floor of the garage to bottom of the shock eye bolt. I measured today and it's 1/2" higher. So I'm supposing that she's riding a little higher in the rear. If I was smarter

and really wanted to know how much a difference the new assemblies made on ride height, I should have taken before measurements from the center of each wheel to the bottom of the fender lip opening and at different points around the Expy along the bottom of the rocker panel to the floor.
What I do know is, that over the years I have pulled some pretty heavy trailer loads and remember how much rear suspension sag there was. I figure that the age of the shocks and some of the long heavy loads probably caused some small amount of permanent rear sag. But, I'm no suspension expert so it's only a guess.
Again, happy with the KYBs and will see how they hold up over the "long haul"
Mako