Under the general info on this page you guys have a link to the 1984 Mexican SS, well two of them. The second one does not work, this one here: "1984 Mexican Version of the Monte Carlo SS on Paul Baumgart's website" That website seems to be down.
The piece of the puzzle that I have been looking for was the rear end in one of them, seeing as how it is not listed. I spoke with a guy in Mexico that has one, the stock rear info he gave me this:
DANA 44 with a 3.07 Gear Ratio.
Hope that helps.
1984 MONTE CARLO SS 6spd
6.HO | LS6 INTAKE | CUSTOM CAM | BUILT T56 | CUSTOM 9" REAR | 3.89 GEARS