What is going to happen when I remove the master cylinder?

†hanks for the info. I plan on using a new Adj porportioning valve along with the old meter block and block one of the outlets. OK so I removed the old MC, and didnt realize I had to first detach the push rod from the pedal. Ok done. Then pulled it off carefully and pushed it into the new MC. However there is no way to attach the old spring/booty panel, as seen in this picture of the old push rod put onto the new MC and the plate sitting near it. Is this acceptable? Also does anyone know the outlet size on the old metering block going to the rear brakes? The plug I bought is 7/16 and is too big.IMG_3700 2.jpg