A body 73 and up vs 72 and older front track width questions.

I know this subject has probably been beat to death but I am looking for some clarification. I currently have a 73 and up front brake setup that was installed by the previous owner, this and the B body rear worked fine with the wheels that were previously on the car (which were off a n early 2000s mustang) I absolutely hated the mustang wheels so I changed the car back to an A body 8-3/4 and put a set of Convo Pros which should fit just fine since the tire size is the same height, however the fronts just barely nick the front fenders at full lock.

So here is my question on the brakes.

I read somewhere that 73 and up will widen the track width 1-1/2 inch from the 72 and earlier cars, can anyone confirm this? I am now considering going back to the 72 and older spindle with a Willwood brake setup, I already know the 72 and older will take the smaller upper ball joint so i will buy the QA1 upper tubular control arms for 72 and older cars.

Can anyone confirm that the older spindle with Willwood brakes will narrow my track width from the 73 and up conversion?

Previous wheel combo in my profile picture.

Thanks in advance!