3038 would not be one of the early cars as they started with build dates first. My old car was from 1982 prior to CCX3-3XXX system being put into place. Check my gallery.......
I miss it....
CCX cars are usually very sound, mine was perfect after many years of New England roads. Maybe someone made mods to body/tub?
Skip the metal plates and use a high quality seam sealer for OEM automobiles. It is flexible and great bonding power. Used in new cars for the same reason plus it helps seal out water. It comes brushable and also caulking gun tube....
Use this in a squeeky seem and say by by to the noise.......