I’m leaning this way. They did not try to hide anything. Had they caught the bad head prior, you would have had to buy one anyway. They noticed the temp issue and pulled the plug. I doubt they would risk there reputation buy screwing you on this. I kinda see the warranty thing. Someone could go out and be ridiculous With it and blow it up. I’ve kinda been down this road. I think you are gonna be fine. Let it go. You can’t worry about something that hasn’t happened and may never. Doesn’t hurt to send emails and ask questions. Be polite. If they start being defensive and rude then you may have to turn it up. I don’t want this to ruin this experience you are having. Basically buzz kill this. The motor should be broke in if it was dynoed. All you need to do is drop it in and run it. You could film that maybe for some proof if something goes wrong. Hope this helps. I agree a lot of money for the engine work. However, it may have been a little rough from sitting all that time outside. Hope this helps give you a little piece of mind.
