Welcome, Steve.
I know of 4 drag strips in California that (to my knowledge) are still
being used, and none of them are limited to 1/8 mile timed runs.
They are in Pomona (at the fairgrounds), Sonoma (the facility used to
be called Sears Point, and later Infineon. I don't know it's current name),
Sacramento, and near or technically in Bakersfield. That one is called
Famosa.
There may be others. Unfortunately, several I used to go to have closed,
including Fremont Drag Strip (later renamed Baylands), Lions, Orange County
International Raceway, Ontario Motor Speedway, and Irwindale (still open,
but now only 1/8 mile).