Can't thank you guys enough for the insights and advice. I've reached out to the resources in ATL that @Lfepardo listed. Excellent post and suggestions.
I've had other classic or vanity cars before, but my expectations for a "new-ish" car with nearly new components were different from the reality.
I wasn't expecting perfection from the car, but the scope of the issues, including a dead #3 cylinder, broken valve spring, persistent transmission leaks, and flaky carbs, not to mention a few other issues not mentioned in my original post, left me deflated. If the repairs were concentrated on one system or another, I could excuse it back to a person or team. But, the engine, brakes, transmission, and electrics have all had issues within 3000 miles. Quality control wasn't the priority. I just wish I had more miles on the car in the first 12 months to sort out the issues under warranty.
Based on the feedback, I'm pushing back hard on my mechanic's quotes. Again, thanks for the insights and support.