Manual or power disk brakes. .?

You need a disc brake master cyl. AFAIK there is no such thing as a power brake master cyl, but there are differences between a disc brake master and a manual brake master.
You also need a proportioning valve with disc brakes. It replaces the simple distribution block on manual brakes. Try to get one from the same car you are getting the spindles from. Or PM me as I have ones from F and B bodies that will work on an A body.