Is it a simple swap from manual brakes to power brakes in a '71 GMC P/U?

[GiMiCs]

Hi again! Was wondering if it'll be fairly easy to install a power brake unit (booster and master cyl. came shipped together...), in place of my existing
manual brake master cyl.? Will lines match up? Will the system line up ok w./ the existing brake pedal? Should I bench bleed the master cyl.? I always did on other vehicles, but since this unit is already bolted together, I'm wondering if it was done at the factory, or should I be on the safe side , and unbolt the master cyl. from the booster and bench bleed it anyway ? Thanks for your help, as I've never done this swap on GMC/ CHEVYS before!