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I was thinking about the upper plate last week. The wear area would be both the plate and casting centering hole. I have seen suggestions to go around the hole with a punch to close it up some, but came to the conclusion that doing so might close the hole up but keeping the hole centered would be iffy at best. Even replacing the upper plate does not mean it will be centered on the distributor core because of it being worn. I had thought about making a jig to put the plate in then using a die in a press to reduce the hole size to what would be needed to remove slop and keep centered.
Never thought about tilt. All cylinders need to fire at about or very close to the same place, time and intensity, so any time something shifts it changes that.
True the castings can be change, but there are only so many. Most average restorers are only going to have access to maybe one or two to chose from.