Could your rebuild have been junk because they used the black blood of the earth, rather than oil, Jack Burton?I have had both. A rebuilt is junk. Nothing but a money hole.
If your kid wants to throw 44k into a bottomless pit for the sense of style then let him. It will be a very important lesson in life when the repair bills come in. It’s a lesson that with every trip to the garage will remind him that he should have bought a new Corolla.
Let it play out and don’t “I told you so”. And FFS don’t bail him out. We all need to be humbled by shitboxes in our early adulthood. It makes you appreciate a good car even more once you get up to one.