$42k?!???! Holy sh*t!! We can get a complete ISX (450) direct from cummins for $21k.
Was it a regen isx? Think it is about 26k for Reman 18 hrs of tear down at 125 bucks an hour. Plus another 40 hours for a swing needs a dpf and catalyst at 4k radiator because when it let loose it put metal into the cooling system at about 2000 in parts
You sir, are a specialist in the art of discovering a welcoming outcome of a particular situation....not a mechanic.