Two screws and the oval plate can be chiseled out of the seam sealant goop.
That body bracket tends to collect a lot of crap.
Sometimes it's not easy to undo.
Jim,
Lil'Red is a '87 F250 HD, 4.10's, 1356 4x4, Zf-5, 3G, PMGR, Saginaw PS, desmogged with a Holley 80508 and Performer intake.
Too much other stuff to mention.