PD

Are you talking about having two upper links that mount from the frame to the diff and sort of converging so that it looks similar to a "V" if you could see it from the top?

If so I would worry about the differing arcs of the leaf spring vs. the upper control arms you plan to add. Just mock it up and run it through the travel a few times to assure that there is no binding that will stop the suspension. Since you are using this on the leaf rear susp it should have enough deflection to keep it from being a huge issue. Are you adding a rear sway bar as well?

This type of a set-up has some benefits, as it keeps the rear centered in the chassis and is "hella stout" (isn't that what you guys down under say) if done right.