So, in the way to solve my problem with the “no crank engine”, I cleaned the injectors.
Ultrasonic cleaning, water rinsing and air drying.
After I painted the injectors.
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…aaaaand?
Would that make a miracle or this is just a cosmetic feature?
“Water rinsing” sounds truly concerning 
As a matter of fact - that’s the only thing you shouldn’t do…
You should always rinse after ultrasonic cleaning. All the carburetors parts, injectors, and so on.
Then you dry at once with compressed air, so no problem.
The cleaning wasn’t cosmetic at the begining. 40 years + necessarily involves deposits that must be removed.
after cleaning (at the begining the liquid is clear)
Flushing with water you say…
Not sure how can you prevent internal rusting after blowing with comressed air (which also holds moisture…). Unless you assume that entire water was removed from the nozzles…
That applies to solvent and isopropanol used in you bath.
Even simple straw of WD40 would help…
Just for info, after cleaning, you have to test each injector with fuel and battery 9V.
Doing this, you remove any remaining water from the injector body.
Now, all the injectors are working very well on the engine. 
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