Big bolt patter upgrade?

Cool so i can redrill the axels and rear drums without compromising structural integrity?

No. You will compromise the structural integrity of the axle hubs because there is just barely enough meat there drill another set of holes for studs. The brake drums aren't a big deal as there is a good amount of room to re-drill them. Moser sells direct replacement axles for A-body housings that have the large bolt pattern. That's the only way I'd do it.