USC has a series of assembly line pictures that it says were taken at the General Motors South Gate Plant in 1952. They give the address as 7700 Tweedy Boulevard, but this is obviously a typo as the GM plant was actually at 2700 Tweedy Boulevard (confirmed by the 1956 CD). Most of the pictures show Pontiacs, and I don't want to start another argument, but I believe the car at the front is a Dodge Coronet. It's picture eight in a series of ten, so could this Dodge really be in a GM plant, of has the picture been placed in the wrong set?
USC Digital Library
Here's how the plant looked in 1952.
Historic Aerials
Not long to go - this aerial shows how the plant had grown slightly by 1980.
Historic Aerials
After the plant was demolished, the site was cleaned up before the South East High School opened in 2005. This is what the former assembly plant site looks like today.
Google Maps