Definitely looks like some Mexican craftsmanship on that car.
YIKES!!!! I guess they went to the junkyard with a tape measure and found whatever would fit. Are those spring perches stock location or moved to fit the bird? According to RockAuto there were two rears available. The 7.5" and the 8.5". Try and find out which one you have. I know nothing about that, or where the code would be, so I can't help. The 8.5 would be the one to have, much stronger than the 7.5. That fuel pump needs some attention too. I hope that isn't rubber hose all the way to the engine. And the brake line T fitting. Air shocks? That brake line is run through what was once some sort of mount. Panhard rod? It will take some work to straighten this all out, but again, if that rear is dimensionaly correct, it is a great thing to have.
