The parts alone will probably be the better part of $2000. A PS setup in need of a rebuild will probably run you $600, plus another $600 or so for a complete rebuild of the PS and steering box by StangersSite.
The parts for the power brakes will be about $200 for a used PB pedal from ebay, and another $200 for a booster. Disc brakes would be another $600.
As for a shop putting it all in, I have no idea, my car has never been to a shop.
I do know a guy in NC that does great work though.
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66 coupe 5.0/T5, home-brewed power 4 wheel disc setup, 350hp+, looks like it belongs in 1968
How much for power steering and brakes on a 1967 V8 Mustang? 
