Rear end geometry 67-72 questions

[VA72C10]

This is on my 70 C10 longbed with RE-7 bags. Entire frame is on jack stands right now. Hope to have the rear on the ground on tires tomorrow night. Waiting on front end suspension parts (2 1/2" drop spindles, RE-7's, and upper and lower plates on stock control arms.

Worked on centering my rear end today in the truck. Fought with it for a while before realizing the rear is off-center by 1". The 72 5 lug is the same as the 69 6 lug...offset by 1" This ends up making the yoke off center as well as making the U-bolt under the notch on one side and against it on the other. I guess this is unavoidable...but wanted to make sure by some wild stretch that I didn't have two rears that are wrong for the truck

I have centered the brakes now so the wheels will each be the same distance from the frame by adjusting my ECE super trac bar. So I guess the 2 piece driveshaft will make up the difference?

Also, I thought about flipping the trailing arm mounts, but that looks to pull them further forward into the notch even though it corrects the angle...
Is my best bet just spacing the mounts? I really don't want to move the crossmember and have to deal with moving the carrier bearing mount as I already set that upside down to get the correct angle. Will this be a good fix to the wheel too far forward in the rear wheelwell issue? My plan is to mock up the bed, get an exact measurement to what I need to center it and then shim out the mounts. Any other ideas?

Right now the driver's side U-bolt binds against the notch and won't allow me to drop it to the bumpstops (in the notch). I can shift the rear to clear the U-bolt and get it down to the bumpstop but then the wheels won't be equidistant from the frame. What am I missing?