Camarillo group = Speedlimit racing
I was in your shoes a few years ago so when I started a blog this year, I wrote a guide to SoCal autocross locations. As a fellow muscle car enthusiast it covers all the muscle car targeted events too.
Check it out here: https://www.autoxandtrack.com/socal-...oss-locations/
The guide talks about pricing event frequency and has links to the sign up pages. I also have video's of the typical course layouts involved. NMCA Hotchkis autocross is coming up the weekend after next and will be sold out soon. 20+ classic muscle cars will show up with lots of other early Mustangs.
I will also be writting a road course guide but for now here are some ideas:
Tracks you can get to easily same day:
Auto Club Speedway (Roval and Infield configurations)
Willow Springs Raceway (aka Big Willow)
Streets of Willow Springs (2nd track at Willow Springs)
Tracks that usually require an overnight stay (unless you are an ironman).
Of the above, Buttonwillow is my favorite. For a first time track driver I recommend Streets of Willow Springs or Buttonwillow. You can drive any of the above tracks but I think those two are less intimidating and a *little* easier on the car.
Main track day organizers in SoCal are Speedventures and Extreme Speed. both offer beginner instruction and a beginner run group with the option to get a full day instruction.
The Shelby Club usually runs at least once a year at Streets of Willow Springs. Awesome event full of vintage Ford cars on track. Run really well with an extra emphasis on safety.