Nice car! Where in California are you? There are several owners around the state.
You will soon hear from others that the (original?) engine is 2 l. 6 cyl in a unique valve configuration. It looks like a DOHC but a single cam operates inclined valves for the hemi-head, using pushrods that cross over. The engine is "Bristol", closely derived from the prewar BMW 328 engine.
There is a Bristol Owners Club you should join.
https://boc.net/s/ They also have a forum that today linked to a (error-filled) news story about the Bristol Car Company.
I've been a BOC member for nearly 30 years; joined because my car (not a Bristol) has a Bristol engine. Jay Leno has a Bristol 403.
Cheers!