Senator A 3.0 E engine without compression……what now?

Evening together, today after more than 18 years I had to learn horrors that my grandmother has almost no compression. Short to understand; the Seni (BJ.80) has been in my possession since 1988. In 1992 the good got a new engine (generally overhauled for 5000 DM, Fa. WEGE engines) installed. About after 20000Km the engine began to run round. I have to say, his performance like the old engine he never achieved… always missed such a bit, but no matter, I drove it further, especially since the warranty had already expired. After all, he did not go bad…. !995 I then signed him off, at 40000 km….and so he only stood around until last year. Last year I revived him and of course the engine was just as fucked up as 18 years ago already. Well, so far. Old Sack already gave me plentiful tips, which I have implemented by now, but did not help anything. I never doubted that the Seni engine had a good compression. After all, the engine has only 40000km down today then the Gong, which woke me up: After ignition, injection nozzles etc. were tested and even the valves were put on a little more play (the default was a little too tight) we measured the compression. Cylinder 1= 8bar 2=2bar 3=4bar 4=1bar ………the rest just as bad Somehow I don’t get rid of the feeling that I had to get scrap built in at the time. What now? Better, as Alter Sack told me often, the 3.0 Install the engine from the Omega A or should I disassemble the old engine and see what’s going on? What’s more worthwhile, especially since my bugget is limited, or actually not available What should I do?