If I may comment (from experience) - why do you want to go 13" eventually?
Large wheels was the single worst modification I ever did on my car.
In all honesty - it is simply not worth it. It amplifies all the poor suspension attributes of a mini and provides no benefit (except styling, if you prefer the large wheel look).
Give your drum brakes a good service and check that all is well. When properly set up they are every bit as good as the discs, they only require more frequent adjustment (every 3 months when I was using my car daily).
From there I would look at 7.5" discs if you want to go for discs or just prefer the wider stance provided by the increased track of the disc brake setup.
Anyway, this is just my 2c and you can obviously do what you want with your car.
Large wheels was the single worst modification I ever did on my car.
In all honesty - it is simply not worth it. It amplifies all the poor suspension attributes of a mini and provides no benefit (except styling, if you prefer the large wheel look).
Give your drum brakes a good service and check that all is well. When properly set up they are every bit as good as the discs, they only require more frequent adjustment (every 3 months when I was using my car daily).
From there I would look at 7.5" discs if you want to go for discs or just prefer the wider stance provided by the increased track of the disc brake setup.
Anyway, this is just my 2c and you can obviously do what you want with your car.
I'm only here to LOL and +1