1989 Toyota Corolla Engine

I need to know what exactly is bad about the cylinder? Are the valves not sealing is that piston not creating enough compression, or is the head gasket blown or engine block cracked or cylinder head cracked? All of which is significance engine damage and/or repair. Head gasket may just need a new head gasket and head resurfacing. Valves not sealing or piston not creating enough compression may just be better to overhaul engine or better replace engine assembly. Typically if you replace just the cylinder head and do nothing about the pistons/crankshaft or lower end of the engine you get great sealing from the cylinder head but increase wear on the pistons because there still worn at the 150K miles. So in other word if your engine is damaged (the above engine damage) and you want to keep the vehicle have the engine replace with a reputable company that re manufacture engines (w/ a warranty) or a cheaper option maybe a salvage yard motor but you never know what you'll get. Some salvage yards provide a warranty option on there engines at added cost but I don't think that includes labor? It pays to shop around and get all the information you can to make a good decision. Let me know if you have any questions,TY