4 wheel power disc conversion, booster and MS recommendation

[General23cmp]

I am putting 4 wheel discs on my 1969 soon, and already have the brakes selected. They are a fairly large, 2 piston model, so I am unsure how large a bore MS I need. I need help finding a good option for master cylinder, but even more help selecting a brake booster as it will tie to the firewall. I am looking for a simple (and minimally destructive to the car's firewall area if I wanted to go back original) booster install, and of course, the master cylinder needs to bolt to it easily ;). Thanks.