I've got a '71, with a 307, TH350, 1-legged 10 bolt rear. I'm about half-way done building a face-melting .060 350 backed by an m22. I was about to order a posi unit and some gears when I realized, I have no idea if it's an 8.2 or 8.5. I looked around, and everything I found said that 71's should probably have an 8.5, and that the cover would be smooth (bulged more to the drivers side, but with no groove). So I've got the smooth cover, but where the "Corners" are on the bottom on either side of the cover, it has the sort of half-moon looking cut-outs instead of like a square corner(If you look at novaresource.com you'll see what I'm talking about...mine looks like the 7.5/7.625, but it has the notches on the top as well, which the 7.5 doesn't have. So...it's a mystery to me. I was looking through some car profiles on here and asked another member, and he was curious about it as well, because he has _THE SAME_ nova as I do, down to the interior and exterior colors etc. So if I need to take a pic I can, but hopefully someone has been down this road before and knows what I mean. Thanks guys.