Hey Rovari, do you plan on doing anything with the engine? I ask because with it been sitting for so long, I'm sure the rings have a high chance of being stuck. My last vehicle sat for less time and it burned a good amount of oil for a good while before the rings finally moved, but it never had great compression. Same thing with the engine I pulled from a wreck to do a swap. Every singe ring was stuck. Even the real thins ones around the oil ring.
If you're not wanting to crack the engine open (wouldn't blame you), you could pour some ATF fluid or mystery oil/sea foam down the spark holes and let it soak for the time you're doing all this.