narrowing a b-body rear

Ok, I had the wrong link. I now have the link I was referring to.


I have a housing for a b-body. Along the way I picked up the pieces to end up with a whole 8 3/4 rear, backing plates shock mounts, everything but new perches. I would like to get this narrowed to use in my '70 Dart. I have the chink, the pig clutch SG, b body axles, all.
I looked thru the search and I ran across this list from a link, and it's also listed farther in the link. My question is how accurate are these numbers? Thanks!!

http://www.moparts.org/Tech/Archive/axle/16.html

that list has the correct measurements..