Henry, your comment jogs my memory ... owners were Robin and Marvin Mathis? I was a friend of one of the sons, Mike Mathis ... around 1973 ... his mother, Jeanette, widow of one of the brothers, was running the station. Once a daytimer, they got 500 watts night with a second tower. KCMO 810 in Kansas City Missouri (in case the calls don't reveal the location) was putting a 50 kw night DA lobe into Mississippi, and I can't figure out how the WSJC night facility ever got authorized.
The Mathis bros also owned the Senatobia AM, and I sorta remember them having the 50 kw daytimer (also on 810) in Jacksonville, Ala (just outside Anniston). May be wrong on that one.
WSJC was originally on 1280, moved to 790 for a modest increase in power/coverage, then made the big jump from there to 810 with 50 gallons. The Taylorsville station actually picked up the 1280 frequency that WSJC had abandoned. I think it was 500 watts, not 250, but that's not significant. Calls were WSCO maybe, for Smith COunty? I was dating a lady from Taylorsville in 1974 and the station had already shut down by then, so it's long gone.