WHEN, is it time to put in NOS ARC Shocks!

Driving around in this early spring thinking; When is it really time to replace my shocks with my RARE new set of ARC's front and rear.
Hmmm spongy on auto, firms up decently on firm ride - is it really time to put the new ones in - which are likely irreplacable - and then I lose that comfort feeling of know I have them!
hmmm
hmmm
hmmm

Ah I feel your pain. (I don't have new shocks but do other stuff).

What amazes me is I will have the new NOS stuff ready to put on and will go buy aftermarket just so I can keep em.

shocks

Any suggestions on what I should use and where to get shocks for my 89 sc with 90k
Thanks