The initial cutting and welding for a radical roof chop was done, but the finishing work never happened. If there was custom glass for this truck, it didn't make it to the wrecking yard.
Under the hood, the same type of L20B four-cylinder engine used by mid-to-late-1970s Datsun 510s/610s/710s and 200SXs. This engine was a cousin to the six-cylinder L engines used in the early Z Cars.
This is one of the very few automatic-transmission-equipped Datsun 620s sold, the first I have ever seen.
Other than the engine, there's not much on this car that is likely to be purchased by junkyard shoppers.