You'll definitely appreciate the quicker steering. Up to a point at least.
Remember if you're also going to a much smaller steering wheel at the same time things start to happen even quicker.
I've got a teeny wheel on mine and the 6-turn box is almost better than tolerable. I'm still going to replace it with the 4-turn box I've already got, but it's not near the emergency it once was.
We sell the Delphi box drilled to fit the EB frame, but I can't remember if they're the Borgeson units or not.
http://www.wildhorses4x4.com/category/bronco_Power_Steering_Kits
I think the pics are outdated as the cast "webbing" encompasses the four holes more completely than the pics indicate. But the function and pricing are the same.
End shameless plug...
The new shaft is a benefit as well. It's $150 well spent ($220 if bought separately) if you want the added safety of the collapsible setup. It's not 100% required. Just a nice upgrade to be aware of no matter who's kit you go with.
Paul