I doubt a 6.0l engine could get that spooling. We had big turbos and stuff like that in the Navy. Displacement could be measured in cubic feet not inches per cylinder for some engines.
I had no clue what the hell it is from, just saw it while reading some block swap threads last night on NASIOC. Some guy was using a turbo from a canadian Dodge cummin turbo deisel. Some guy posted that picture. I thought it was a fake turbo or something but funny picture!
Definitely a rotated mount set-up. Prolly' need a custom 22" DP. The only problem would be that the heat shield would weigh 100 Lbs...