From left, Old Yeller IX, Old Yeller VIII, Old Yeller VII, and Old Yeller II. (Photo from Reagan Rulau) / information and photo from http://www.tamsoldracecarsite.net/MaxBalchowsky4.html
from Ron Cummings: "Old Yeller VII was sold as a bare rolling chassis to Don Kirby, a driver in northern New York state. He installed some sort of a body and a Chevrolet motor. The car was raced in east coast events as "Old Yeller VII". Max, at the time, claimed no knowledge of the car because it was sold only as a chassis.
According to Reagan Rulau, Brock Yates and some friends later installed an Ambro plastic body that looks like a Birdcage Maserati. The car now races in that configuration."
Ron Cummings located this ad for "Old Yaller VII". It appeared in Competition Press Oct. 27, 1962 Vol. 9 No. 8: "OLD YALLER Mk 7. Latest car built by Max Balchowsky. Corvette 327 fuel-injected engine completely rebuilt. New paint, concours con- dition, over $8000 invested. Don Kirby, Dreamland Park, Rochester 22, N. Y."
If you aren't familiar with why I'm a big fan of Max Balchowski, http://justacarguy.blogspot.com/2010/08/max-balchowsky-creator-of-old-yaller.html