How were the A bodies put together down the assembly line?

I thought you were asking about the pic that looks like a cutting torch was used to enlarge the hole ?
I can’t imagine the line doing that,,,,maybe grinding,,,but not a torch .

The offset hole location looks kind of typical for some body fitment,,,,poor QC probably ?
You have to remember,,,,these things were moving along pretty quickly,,,,,you didn’t want to be responsible for stopping the line back then .

And don’t feel bad,,,,I have a friend that is a Chevy guy through and through,,,,,he talks about their products more than ours .
He claims that all Chevies are out a fair amount,,,if you really measure closely!

Tommy