Upgrades/conversions before LS swap

[stealthtt24]

Hey guys! Recently purchased a 50 3100. I've been compiling my goal list of what i'd like to do to the truck. The end (read: far out) goal is LS swap with Mustang 2 front. It runs as of now and I'd like to keep the downtime to a minimum. My question is this as I haven't really answered it in my research...

I would eventually like discs in the front, power steering and power brakes. For now, to keep the truck on the road as long as possible, is there a dual master cylinder I could use that would work with drum drum then disk drum? Also any other conversions/upgrades you could think for safety/modernization? I am going to piece together the mustang 2 IFS and buy wheels/tires accordingly. I did see the 12 volt conversion which is definitely on my list. Also I'd like to keep the master under the floor. Thanks!