Maybe that is why he qualified his statement with "almost".
I think it's simpler than that, I think he just knows that he doesn't know enough about the inline 6 to know if they used other material or not, so he qualified his statement with most to cover his @$$.
I'd say *they* did a pretty darn good job on that rebuild, better than most DIY folks...he obviously had help from a couple other shops, but the works he did was pretty darn good, even the masking/prep. Seemed to be a good rebuild that most anyone owning a Stovebolt wouldn't mind having in their truck.
Seems overkill for a 3/4 ton, when most folks want 1/2 tons. My $0.02...but I couldn't do that type of work myself, he's got a lot more experience as a wrench than I do.