1984 C30 hydroboost - Hey i have a 1984 c30, I know for a fact that my hydroboost (which has 266000 miles on it) is dying! The booster is leaking ...

Hey i have a 1984 c30, I know for a fact that my hydroboost (which has 266000 miles on it) is dying! The booster is leaking from literally every crevice. I know it needs to be either rebuilt and replaced, but do i have to unbolt if from the fire wall to replace it? or can i seperate the 2 pieces of the pump and replace the middle piece? (in between master cylinder and piece mounted to the fire wall) Thanks! Dave