262 General: V6 not starting

[1978]

Have recently purchased a 262 coupe which has been parked up for many years. I will start and run on all 6 cylinders albeit for a few seconds. I discovered that there was no fuel coming out off the fuel distributor so replaced all the seals and tin gasket which was damaged (someone had been in there before) I now have fuel pressure at the injectors but only 3 injectors spray or should I say dribble or squirt to one side. I am assuming that the injectors could be blocked with fuel residue due to the car being unused for so long empty of fuel. My question is are the injectors serviceable or can they be cleaned? Or is it looking like new injectors.
Many thanks in advance Pete