Buddy of mine bought a Titan motor with a nonstock cam I believe. Think the rest of the motor was stock. I don’t think the engine has any rubbing issues but it did leak out of almost all of the freeze plugs. Right after the break in for a few of them, and then a few of them later. It’s been a while and I’ve only watched slowly over the years, but I haven’t seen many glowing Titan reviews.
I don’t really have a good suggestion here. I can say that after nearly 10 years of reman 4.0 research, I haven’t find a single company that has truly good reviews. Seems like they all cut corners where they can. My suggestion if you can swing it would be to get a motor built to stockish specs at a good machine shop. But, doing that is a stretch for many people. Could also look for a used junkyard motor. I personally would stay away from any $2.5-3k reman. The reviews for all of them are just terrible.