Good question. I can't remember the last time this was discussed. I think in some cases the change is minimal to none. But with others, it's moved back a smidge.
But have you already made your transmission choice? Will it be the AODE or could it be something else? And body lift, or not?
And by "body work timing" do you mean that you're having your body painted soon, but don't have all the potential mods done?
If so, personally I'd wait until ALL the mechanical work and decisions have been finalized and made and mocked up, before committing to paint. Even when it's all thought out, there are still times when you have to cut something that has new paint, because you changed plans or forgot something.
You probably knew that already. But I'm bringing it to the top anyway.
good luck.
Paul