I have an 8 1/4 from a 70 belvedere slant six car. I am thinking to use it in an A-body down the road but I have always been curious if it was the same set up because it is so early.
I even had one in a 69 Satellite more door about 10 years ago, so I know that B-bodies had them that early even though I don't think it was mega common as most B-body cars had 8 3/4s