Spindle the same?

I would do more research on this " brake upgrade."
Know what you are doing before you start to buy parts and then hope the parts will be compatible.
Get/download a few Service Manuals, preferably the year you have and the year you are trying to use the parts from.
Search for articles about the same conversion you are contemplating and follow thorough on all the aspects and parts needed to do it.
Parts like master cylinder type and size. spindles, control arms, brake lines, combination/proportion valves, wheel cylinder sizes, brake pedal linkage, ratio etc...
More important system on any car is the brake system. No experimenting here.
How To Install A Big-Bolt Pattern - Mopar Muscle Magazine
Upgrading Front Drum Brakes With Factory Disc Parts
And there is much more info out there...