Lokar makes a power boster/tandum master Cyl too, but it only works on the Powerglide car.
Then; all you need is to find some 51 or newer drums & backing plates & your Bendix all the way around.
Many have used a 70s master Cyl. & boster and mounting it on the firewall.
Just going to the Bendix system is really all you need and is the cheapest route. Keeps the original look too.
Good luck.
