first brake mod?

[RegalX]

I have a 78 Regal and Iam curious what are some of the best brake mods for you money? It has factory aluminum rear drums, I was looking at some oversized calipers from U.S. brake, is anyone currently running these? or larger master cyclinders? Just curious, the car runs low 13's and I'd like a little better brakes at the other end. The only thing is it has stock 14 wheels, so I am going to have to work around those