thats just water from when I washed it before i took the pic lol and yes wd 40 on the metal parts

From everything you've said and from what you've done already, it really sounds like you need to get the car jacked up and check those brakes. At the very least you will eliminate them as the cause and more than likely you'll find somethin awry in there.

Until you do, all else is speculation.

Question... were you on a straight road at the time of the noise?

When I had a metal on metal clanging noise from my front end, I was able to determine it occured only after a certain speed and only when curving/turning to the right. (ended up being a metal clip on the rotor).

You may need to experiment with speeds, turning, etc to re-create the noise...which can then better pinpoint the problem area.

Jack the rear end of the car up and turn the rear tires by hand as fast as you can. Is it difficult? Does it make any sounds?

When the adjuster kit and spring went in one of my drums it made a loud metal scraping sound every so often until it was doing it all the time. My braking power was also sub-par.

Both wheel turn very smoothly with no noise. I notice when I am backing up first thing in the morning I get a nasty scraping sound comming from the back, but then it seems to go away. Also, after a while I get a lunging feeling from the back brakes at slow speeds when i use little brake pressure

BTW, what is the procedure for taking apart these rear drums (i had only discs on my '91 cutlass)? What should I look for?

Like said...time to pull those brakes and be prepared to repair.

To look and diagnose..

Jack and support the rear.. remove the tires.. the drums then pull straight off like the tires.

Depending how long they have been on their, sometimes it takes a BFH, cussing and more cussing.

The rear brakes on my car at 138K mi have been making a scraping sound when backing slowly out of the garage and occasionally. It usually is on humid days. I attributed it to brake dust.

I finally pulled the rear drums and had lots of band depth left and lots of dust. I used sandpaper to cut the surface of the bands and roughen the drums. That seems to have cured my problem for a while at least. I assume I had glazing on the bands that caused some of the noise.