February 13, 1955 - Lee Petty starts on the front row and wins at Speedway Park in Jacksonville, FL.
http://bench-racing.blogspot.com/2013/02/february-13-1955-lee-petty-snags-jax.html
I was fortunate to find a reasonable news clipping for Lee's win, and Greg Fielden's books were a great resource as always. Its going to continue to be a challenge finding info on some of his 1950s era wins, but we'll deep on a'diggin.
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Schaefer: It's not just for racing anymore.
updated by @tmc-chase: 12/05/16 04:00:58PM