sems like the hg would have to be very blown to get a zero on a comp test. Sounds moe like a bent valve, or possibly a ringland. Have you checked to see if someone installed mechanical rockers? It's possible that the previous owner overtightened them if they have been installed.

8 Starion SHP, 87 mitsubishi van, , 81 galant g54bt, 78 lancer g54bt, 1965 Mitsubishi Debonair Deluxe
87 swb montero offroad pkg goin g54bt with sr locker 33x12.5 dual bouncy.