Rstreet,
I remember Roy running the '65 Impala in 1965, in '66 he ran a '66 Impala, probably was the same car just updated the sheet metal. Before that he ran a '64 Impala, it may well have been one of the old '63 factory cars that he bought and the updated metal. That was common, we had a '65 Pontiac that we later changed to a '66 so we could run it one more year. Back then NASCAR allowed you to run them for 3 years, most of the independants would upgrade them if possible.