considering doing the 73 Up BBP disk swap on my dart. But the thing I dont like about it is that it widens the track width.

Does anyone know for sure, How much it will widen the track width ? I thought it was almost 3/4" per side, but I had one guy try to tell me its only about 3/8".
It seems pretty visible to me on the 73 up abodys that the front wheels stick out quite a bit more than the rear.
?????