I can't speak for WRKO-FM in 1967, but I moved to Manchester, N.H. in the summer of 1968, and at that time 98.5 was a partial simulcast of the AM, the rest of the time was automated top 40, more or less the same playlist. Arco the shy but friendly robot was gone, strictly a jukebox. Didn't have a stereo receiver at the time so I don't know if any of the music was in stereo. Shortly after they moved to Government Center in late '68 they switched to Drake-Chenault's "Hitparade" format, which was replaced with D-C's "Solid Gold" (which was actually about 60% currents) after a couple years. Sometime in early '73 they went oldies, not sure if it was locally produced or syndicated. In those days the oldies format was almost exclusively pre-1962, an era that held/holds very little interest for me so I rarely listened.
I don't think they went live until the late 70s.