8-3/4 centre section swap

There's an A body 8-3/4 rear for sale locally that has a 741 centre section with 276 gears. Housing, Axles, aftermarket rear sway bar, backing plates, brakes...all is there. My questions are:

1) Can any centre section type be swapped into the housing?

2) Say I want the better 742 or 489 centre section. What is required for the swap?

3) I'm assuming the axles will need to be swapped out for this as well?

Thanks:burnout: