Looks like the livery of Harrop's A/FX car with its lettering removed.
The only factory 10"/15" AWB, built by Dick Branster.
Except both of Harrop's cars were hardtops and the Sedan that Branster built was for Bill Flynn (Yankee Peddler). Harrop totaled his original car, and then replaced it with the Lindamood Color Me Gone car...Bobby crashed that one too.
The car in the photo is an Eastern Ohio/Western PA piece. I have some more photos of the car and it was cut to practically nothing. Most of the interior floor/trunk was cut out, as well as the inner fenders. I've spoken with a few local people who raced around the time these photos were taken, and no one remembered the car. Alex Theofilos owned Sunset Dragstrip, where the photos were taken, and he would often book in match races, etc. I am thinking this was a local car that someone told Alex they were building/built and were booked in as filler? Alex did this quite a few times if someone canceled on him, or couldn't make a date for whatever reason. There are other photos that appear to be taken the same day with a few 'name' cars of the time.