I believe the car is
#33, second place finisher Rex Mays in the Stevens/Winfield Bowes Seal Fast Special.
He completed 200 laps, led 59, earned $15,950. Click the little car to see a larger
version. It's still moving, so I reckon this is very shortly after the end of
the race.
The gray rectangle below and left of the flags at the right edge
of the picture is a scoreboard. Click it to see an almost-legible version displaying
the car numbers and the placings of the first five finishers:
1, 33,
7, 3, 8. Shaw, Mays, Rose, Horn, Thorne.
Above the lowermost, rightmost white shirt at the bottom border in
the above photo is a fellow who must have had a "Show" bet
on Mays. Click the white shirt on the bottom border to see the happy
man.