Jack it up?

'70 Sport Fury

So I've got the big ol adjustable shackles on their highest setting and some hijacker (or whatever brand) shocks and when I pump it up to the stance I like (higher in the rear, not much fender over tire), I've lost all suspension travel hahahaha.
So my question is how do folks jack up the back of their C-bodies without them riding like a dump truck? I replaced the leaf springs recently and they were slightly more heavy duty if I remember correctly, but they didn't do much...

Jack it up?
Author: B-Rode