Power Brakes For A 74 Chevy Truck

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I just pulled a 74 short stepper out of a barn and got it running and driving .It is manual steering and manual brakes .What booster do I need to look for to convert to power brakes ,what other year truck booster will fit ? What about power steering ,what will fit from another truck ?It has a 250 CI 6 cylinder and 3 on the tree . Any info would be appreciated as this is going to become my daily driver until my 72 comes home from the bodyshop and then it will be sold .