Is it possible that he died in Sep 1961? I had a little extra time at the Orlando library and found this obituary:
Orlando Sentinel, 20 Sep 1961, page 8B
Mr. Frank Rock, 80, 1323 40th street, died Monday. Wife, Mary E..; three daughters and one son, all fo New York State, 14 grandchildren and two great-grandchildren survive. Carey Hand Funeral Home is in charge.
Orlando Sentinel, 21 Sep 1961, Funeral Notices
Rock, Mr. Frank - Funeral services for Mr. Frank Rock, 80, 1323 40th street, who died Monday, will be held in the Carey Hand Chapel, Thursday at 10 a.m., with Mr. Donald B. Ford officiating. Interment will follow in Woodlawn, memorial Park. Mr. Rock came to Orlando in 1949 from Ticonderoga, N.Y. He was a member of Jehovah Witnesses. Survivors include his wife, Mrs. Mary E. Rock; three daughters and one son in New York State; 14 grandchildren and two great-grandchildren. Carey Hand Funeral Home is in charge of arrangements.
Last... there is a marriage of a Frank Rock with a Mary E. Patrick McFarland that took place in 1950 in Orange County (per vital records index... no further info except the certificate number which I did not write down).
Hope this helps,