They seem to last forever - I know a guy who fixes the pumps and he said me that usually the old IPs that come to him have not got the oil since last decade.

Luckily if the injection-pump is damaged, there´s plenty of those in the world. I actually bought a similar good motor as yours and the rest of the car for around 400 $ for spare parts. Green bastard. With a brand new starter-motor. Unfortunately I have suicidal friends and one nastily blacmailed me sell him the car for restoring.. I sold it with same price but kept the starter.