As I had stated earlier the dana will be 1 inch narrower overall, 1/2 inch in on both sides.

The springs are in the stock location.
That's the problem with 66/67's, you can't move them into the frame rails and run tailpipes in the stock location.
Much less the 3 inch TTI tailpipes that my car has. They run under the rear frame rails.

Dan moved the spring perches in on the axle 1/4 inch on each side from the stock location on the dana.
I hadn't planned on that, but he says he done it before and it will help on the clearance to the springs and works fine and it's no problem lining up the rear end on the spring centering pins.
The distance from the springs to the tire is a fixed (non moving) distance.

The fender lips are the ones I'm worried about.

If I have to roll the fender lips or trim them I will.
I'm gonna wait till I have the dana in the car to see what the final clearance is first.

It's still an original 18k mile unrestored body so I hate to cut stuff if I don't have to.
But I will if I have to.