Questions for those that have moved their leaf springs in...

That's a 3 inch relocate.
FYI
There is a 3/4" relocate that leaves plenty of room for 3" tailpipes. I fit 325/50-15s into the factory tubs of my 68 Barracuda with those. It was tight at my lowered ride height. I had to get creative with the BFH in a couple of places on the inboard side, and on the outboard side, I curled the lip up. It works fine in straightline work, but I have to tone it down in the turns. I think it would be fine at factory ride-height. I narrowed the rear to use the common 15x10/4.5 BS wheels.