Swapping rear end question.

I have a ‘68-70 B body 8 3/4 in my Duster. So yes, I’ve done it.

And I moved the perches, because I can weld and understand how the suspension is supposed to work.

I’m sure lots have people have done the shade tree install, and quite frankly I don’t care. Doing it wrong and lacking the ability to tell the difference does not make it right. Not to mention, you’re losing tire clearance doing it that way too.
Well you make the assumption that everyone has your abilities, most don't, I am glad you do. I'm just telling him the easy way to do it that works and has been done dozens of times over the years...