Nope. That chart is a flaming disaster. It’s wrong about the A body dimensions.
7.25 and 8.25” rear axles have different widths than the 8 3/4’s, and that chart lists the 8 3/4 SBP width for 73-76.
If you get the width of that B body axle, I can make you a recommendation on the backspace. Or mount it up and take the measurements, that’s the way to get it right for sure.
