Thank you Clay, Many photos available of that tragic crash, many taken by Indy track photographers. The one given to me came from one of the many race fans of Jim. At the far end of the picture, you can faintly see a red car, that was Jim, with plenty of time to stop prior to the fire. The car closest to the fire was Eddie Sachs who crashed into the burning car. Many changes were made at the 500 after this disaster, 4 compulsory pit stops, bladders in the fuel tanks, limit on fuel capacity, limit on minimum dry weight, no gasoline. 1964 was the first and last year that cars were to attempt the 500 with no pit stops, and the first year that gasoline was allowed. Most cars held over 100 gallons of fuel, our held 115 gal. The weight force of that much fuel in a curve is what caused the crash..
Based on your title I searched the internet for the 1964 Indy 500 and came across this article. If you look at the picture, it could possibly be the same as the one you posted, just cropped. You can see the man in the lower left hand corner of your picture in the picture in the article on the left edge about an inch from the bottom. A tragic crash that cost 2 drivers their lives.