Right, a decent job should look like the factory did it. There's really no excuse for a shabby GM swap. Now, about that 1965 Buick Skylark with the Mopar 440 on Ebay ...

I think it's also a reaction to the multitude of Chevy small blocks that were swapped into cars just because the engines are the cheapest to build. I don't remember hearing much about number matching back in the '80s either.