Would you say this inectors buggered and has to be replaced?

How has this happened?
Im holding off getting them reconditioned/replaced because Il be needing bigger ones when I go down the 2.7 turbo route - is this a wise move?
also
why have I got the 'mayonnaise' shit in the inlet manifold? (head gasket gone? - apparently its been replaced before I brought it) - I found some on the oil cap too which I thought was there because the cars been stood for over a year and half while its had work done to it.


