I used to do it that way as well, the nice part about blocking ports off is you know all the air is out when you can't move the piston much. If you are carefull removing lines you don't even have to bleed the brakes after a mc replacement. I would say 3 out of 5 I don't do anymore bleeding on the car after it is installed.
Cheap Thrills Off Road
2003 F-250 4X4 7.3 PSD Crew Cab