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Right, I was having a hard time finding information on the internet regarding a swap other than to a Cummins. That appears to be roughly a $10K swap if I perform the labor.
Regarding the symptoms the idle was really rough and the smoke out the exhaust was blue. I found a lot of oil in the CAC, turbos, connecting pipes, etc. Apparently the #2 cylinder blow-by was pushing the oil out of the crankcase and into the oil fill tube, with the overflow venting into the air intake. I also found a bent pushrod on #2, and a camera down the injector shaft revealed the piston was split down the middle.
There are several people on the Spartan board who run a 6.4 on hot tunes for years without any issues (mainly due to several key aftermarket parts and deletes). At this point I do not tow enough to commit to financing a bulletproof 6.4 build since I am already in need of a long block (the Ford Tech's opinion was the cam shaft was bent, hence a long block was quoted).
If I pull a engine I will have to also pull the computer, so the auction or wrecked truck approach is likely the path forward.
I guess I will document for a possible write-up... someone else may find themselves in this same boat one day.
Thanks for the input.