"I worked on the JFK at Newport News Shipbuilding & Dry Dock Co. in 1968 during the final phases of construction and outfitting. Last of the non-nuclear U.S. carriers, I think"
It was the last, I believe. I was stationed on the Kennedy from '76 to '77.
She was definitely the last convetnionally powered carrier the US built.
She will probably be decomm'ed in 2007 or 2008.
Here's a site you may find some interest in: