I've searched on and off for some time now and can't find any information on the custom car that sat in the back of Tubby's Drive In parking lot with gullwing doors. It can be seen in the background in a few scenes and is even driven behind Danzy and Pfiefer when they are talking to each other at the wall between the drive in and the speed shop. I know somebody here has to recognize the car. 3.2.1 GO!....Let's see how fast this gets answered.
Looks like the "tower of power" 56 chev low rider, it has had numerous paint jobs over the years https://kustomrama.com/wiki/Ismael_Robles'_1956_Chevrolet