4x4 options ?'s

[Coma]

Ok, this will probably make me sound stupid, but it's something i have been wondering about.

I have June 97 issue of 4-wheel & off-road that lists 73-87 engine, trans, t-case, and axle options. According to that article the two following trucks don't exist.

Mid 70's 1/2 ton snb 4x4 with a 454. Not sure about the year, trans, or t-case since it's been a few years since i saw the truck. The article says a 454 was never an option for a 1/2 or even a 3/4 ton 4x4.

79 1/2 ton swb with 400/400/203. The article lists the 400ci in 1/2 tons for only 75-76. It also says you couldn't get a th400 in a 1/2 ton.

From what the owners of these trucks said and from what i saw, both trucks looked like they had never been touched. They looked completely original. So is the article wrong, and these trucks are original or is it right and the trucks aren't original.