68 Cuda , moving Dana back 1 " question

Got the old rear out , finally getting ready to get the chassis work done .
I want to move the Dana back 1" in my 68 Cuda for larger tires .
I have the Mopar spring relocation kit , and Superstock springs . The springs will be inline with the frame .
And the car will be mini tubbed .
Will the shackle interfere with this brace ?
It looks like if I drill a hole 1" rear of this one it might interfere .
Any pics and tips guys ?
Thanks Donnie