I just installed new AGX shocks and springs from the folks at Fly'in Miata on my '92 with 107,000 miles. I had the car aligned using the specs from Fly'in Maita. While the car handles much better, I think I will try the alignment specs from Miq Millman on the Miata.net.
I really, really like the adjustable shocks as I am able to set the dampening so they adequately control the springs and not jar the fillings out of my back molars on these nice roads in Pennsylvania. (Wife appreciates this, too.)
G. Lee