My 1971 Duster 6.1 Hemi build
I'm not sure what your rotor offset is. If everything else was the same as mine...
Just for comparison purposes, my car has:
74 A-body Disk Spindles
Dr Diff 13" Mustang Cobra Brake kit
Hotchkis UCA's
Alignment -3/4 degree camber +7 caster, 1/16" toe
The caster moves the tire back in the wheelwell a bit so that puts you in the pan head screws. I also had to do a small slice to the inner edge of that tab but it's not a huge deal. The dodge versions don't even have that tab.
If your wheel and tire setup is actually narrower on track width than mine it will help a bit too.