Looking at the photo,I see that the Gun Mounts still have both "bubbles". I reported aboard Feb.1969,by then one of the bubbles had been removed from each mount.Changing them from Mk42 Mod-7 to Mk42 Mod-8.
I was stationed at F.T.G. GITMO,Cuba from Feb.1976 to Jan.1978. During that time frame the Adams came in for refreasher trainning. Having gone through a yard overhaul to have the GUnnery Improvement Program installed.
Hope this helps clear it up a bit, probly just stirs the mud up a bit more.
Paul Chapman GMGC,USN-Ret.