[samaron]

I certainly wouldn't want to do anything that causes permanent irreversible changes.

The backing plates in the rear are very different from how the later ones look, as far as I can tell. I assume it is the same story in the front as well since it has wheel brake cylinders in the top and bottom.

I'll give the club leader a call and ask. He happens to run a parts supplier business as well, and is very good at looking up information in the Volvo books. He should be able to cross reference the various parts and catch if anything has significant changes that will prohibit a bolt on swap.