Multi Part question

I have searched my brains out and am even more confused :violent1: I have a 1970 Duster that I am building from the ground up (my first build ever :headbang:) and I recently acquired a 8 3/4 shortened rear end. My questions are as follows:

1) The rear-end in question is in pieces and does not appear to have "dust shields" which was part of the Disk Brake unit. Is this something I need if I plan on using a Rotor type brake system?

2) Will the stock spring perches work on this rear-end or will something need to be fabricated or purchased to accommodate the larger axle tube?

These might seem like simple questions but I can seem to find a specific answer.

Thanks for the help in advance.