I have also been cleaning up the front end in preparation for putting the front sheetmetal back on the passenger side (and removing the driver side!). I didn't take a before of the core support, but it was rough and crispy. It is now smooth and uniformly black.
In total I cleaned up (so much grime and surface rust) and painted
- radiator core support
- radiator brackets
- front bumper supports
- frame ends
- crossmember