thank you everyone for your messages
as you can see,on the two last pictures, the iron fillings of the tappet, mixed with the oil, produced a strange mud, very thick, on the intake manifold i put a deposit that i took off with my bare fingers, it has the consistence of solid patch.
I was warned not to use pressurized air as the dirt could go everywhere in the circuit, but that thing was so sticky and hard that i took ni risking using the compressor, then some cleaning, and repeat the process several times.
so yes, it is clear that due to this mixture, oil could not go through the middle of the head.
some cams received severe burns but i was told it is not a problem.
the motor still runs very smoothly, with a nice sound.
Problem is, I cannot use the brakes, and volvo 1257207 simply does not exist on ANY market . I already used 2 second hand pumps that filled up themselves with oil and i dont want in any case to hear again this terrible rattle that might break the camshaft, because of a used tappet.
V8, I dont understand the word "bore"; it only means "annoying" to me. are you speaking about the hole of the tappet? if it is the case, yeah, it's ruined, as you can see. I had no choice but to use a big vise-grip plyer and hit it hard with a hammer and a big screwdriver to make the tappet fall down. I didnt think about it in the first time but for sure there will now be some play if i put on a new tappet...
I heared of the electrical pump and i am willing to go for it. But I truly lack the skills to think about how i could do the job straight. I would be happy to benefit from the informations, and I'd be glad to pay for a service of remote assistance to help me install this new kind of pump.
If one is able and willing to help me directly, don't hesitate to PM me