Thanks to your input, I went with a MAF long add-a-leaf in the rear of my '83 to fix the sagging HFS rear packs. I deleted the smallest spring to insure a smooth ride. Best $52 I've ever spent.
Before:
After:
Took about 1.5 hours each side with hand tools.
Oh, and yes I know my tailpipe is about to fall off--it's on my to-do list
Before:

After:

Took about 1.5 hours each side with hand tools.
Oh, and yes I know my tailpipe is about to fall off--it's on my to-do list