Disc brake upgrade options / drop spindles.

[muddstir]

I just dug my 71 out of storage, sat 6 years untouched. The entire braking system needs to be replaced but I don't just want to replace it I'd like to upgrade it. All I know is sometimes the spindles can determine what you can do for braking upgrades. ( even if that is right).
I am looking to lower it with drop spindle so I'd like to buy the right ones that will let me to run a better setup. Or is there even a swap that can adapt other better setups to most drop spindles?
Trying to find a good build thread on this with my allotment of time I've got hasn't pan out yet. So anybody know of one ?
Man I hope this made some sense.