Technical brake master and booster

Looking to place a brake booster and master on my 48 Merc, I will be converting to disk on the front , Looking at speedway , they have a booster attached to the brake pedal I also am converting to automatic. Any other suggestions thanks

 

I would start with the stock master that corresponds to whatever donor car your front calipers are coming from. If the donor was disc/drum then you should be all set to just replicate the brake plumbing of that vehicle in your '48.