Further south on Orange County, one the same street in Irvine is a Segerstrom Shelby Museum:
https://g.co/kgs/fYV7oHE
and the headquarters of Hillbank Motorsports Superformance (Cobras, GT40s, etc):
https://www.hillbankusa.com/
Then there is Eurocar near John Wayne Airport if you Ferraris, Lambos, etc.:
https://www.eurocaroc.com/
And one of the largest Cars and Coffee gatherings which is in San Clemente:
https://www.southoccarsandcoffee.com/