Power brake booster and master cylinder for 67 barracuda

Hi, I was wondering if there is anyone in southern California (I am in long beach) that knows how to work on brakes for a 1967 barracuda. I was told by the Clinic in Long Beach the brake booster and master cylinder need to be replaced, but they closed down before I could get the work done.

The car is all drum brakes, 273 2 barrel, power brakes.

I called classic industries, but they were no help in telling me which parts I need. Not sure who might have them available to purchase or what to get.

From what I can tell on the broadcast sheet, code 476 indicates HD drum brakes 10", but i was told the drums are 11".

Any help is appreciated, thanks!
Shane

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