This is the "George Carlin / Comedian" car.
HD Radiator with 3.55 axle
A PY member owned, or still owns, this #'s 4spd car
The B-a-T car was likely born a 3.55 axle car with HD Radiator option like the Carlin TA, from what i can tell.
It was a cheap option and a worthy choice for any car with any axle.