Hi George, It appears that it would need to be replaced, if i am looking at it correctly, in the picture showing the crack, the nozzle would be sitting on top of the holder. where the two pieces come together, the nozzle & holder are lapped to be perfectly flat & ensure that the fuel does not leak out. if the crack allows fuel to leak it would not allow pressure to build up enough for the pintle to be lifted off the seat & the injector will not "pop". Only reassembling it & having it tested will tell, even if it does work, when it comes up to operating temperature it may begin to leak. Sorry to be the barer of bad news.
Scott R.