Master cylinder upgrade

My 64 Barracuda has non-power brakes. I am rebuilding the braking system and want to upgrade the master cylinder to a dual reservior system. Is there an easy upgrade kit or part number that will work? Thanks for any help.
Billlove74

Parts store! Should be an easy deal, just ask for any Mopar A-body application '67-up. In a quick search I found one at the Zone for my '71 Dart. Link here. Just showing an example.

Master Power brakes should also have what you need, probably more expensive.

You'll need another line too and you might want to look into a proportioning valve to adjust the front to rear bias so you don't lock 'em up every time you step on the pedal.