Not really trying to be rude, but are you serious? Four teardowns and still having major engine issues? There are so many issues with this "repair", it has to be a troll.
That was my thought also. But I'll give the benefit of the doubt. Now that said...You buy a vehicle that you have no history of with 80k miles.... Ignore the noises and Hemi tick for 80k more miles....And then you tear it down 4 times. Dude....I truly don't know where to begin. I do know that if it was my vehicle I would have tuned it...new plugs and wire boots. I would have gone with a top quality synthetic oil. And thats just starters. Tearing it down 4 times. That isn't ever going to happen. I'd dump it if it failed after the first tear down. Maybe repair it and sell it. The vehicle just wouldn't be for me.