If I had to guess I would say that car has 6.00 in front and 7.00 in back. I remember a post a long time ago on the HAMB that a guy was talking to an old time hot rodder from back in the day and he said they would never go more that one full size bigger for the rubber rake. ie 6.0's and 7.0's or 5.5's and 6.5's.