Here's a bit of a interesting fact, that probably isn't particularly well known:
http://news.google.com/newspapers?nid=1870&dat=19590217&id=22YpAAAAIBAJ&sjid=E8oEAAAAIBAJ&pg=3146,2854764
Alongside the Convertible Series & Grand National cars intended for the 1st Daytona 500, Bill France Sr. made provisions for 4 Jaguars to compete. As it happens, these Jaguar entries did not materialize.
updated by @simon-cook: 12/05/16 04:00:58PM