I ordered my BBP Moser axles with the A-body offset so I wouldn't have to change my brakes. My drums were in nice shape, my shoes and wheel cylinders were new so I figured why change them.
I redrilled the drums myself, using one of the moser axles as a template. Really no big deal.

Most guys will go with the b-body offset axles and add bigger brakes, but no, you dont have to do it that way.