After looking at Autozone, there are 2 Blower Motors (cage included) for a G-Body. I put in: [87 Cutlass Supreme 5.0L]
I got the Four Seasons #35334 and VDO PM140. Both state they are Clockwise rotation.
As for cages:
The Four Seasons #35601 Metal Cage (Rockauto says Galvanized Steel, Autozone says Aluminum) (Clockwise)
I looked at the BW9301 Metal Cage (Counter Clockwise). It states it's compatible with PM105, PM111, PM121, PM240, PM285, PM285, PM360. The PM105 is the replacement blower sans cage (listed as Clockwise).
I think the BW9301 may be labeled wrong, as every other thing (Blower Motor Complete, Blower Motor No Cage, Cage Alone) is listed as clockwise.
I actually have the Four Seasons 35334 at home in a box. I'll have to check out the cage on that tonight.
Hutch