I just wanted to update, my notes i had of spring heights seem to be compressed heights, a replacement spring seems to be 12.5" free height, and 10.5-11" loaded height.

Both Napa online and Advanced Auto online give spring specs. I also looked at 1973, 1985, 1992 to see if there was any difference over the years, and by aftermarket standards, there isnt. There are heavy and severe duty upgrades on the springs which will raise the front so beware of that also.