Yup, they're dead: note the reverse arch near the shackle.
Shackle tilts rearward as spring gets longer...because it's flattened out.
Those look like regular 383 springs; I see what looks like 4 leaves.
The Mex-made springs have been infamous in any case, for just that issue.
The EZ-550 helpers I mentioned are the least expensive fix.
Best fix is ESPO/Springs&Things Hemi springs in stock height, or +1" if you carry lots of stuff.
The ESPO Hemi +1" on my '68 RR have the car a bit higher than OEM.