91 cherokee 4.0 auto 170k miles. Ok, the PO had a problem with my jeep over heating. I got it, had the head milled. Replaced the head gasket, water pump, radiator, clutch fan, thermostat. It still leaks antifreeze and has coolant in the oil. I'm guessing it has scored the block. You can see coolant on the side of the block from around the intake and exhaust. So should I just get another engine from the JY and start all over? Or should I have the block decked? My local pull a part has several engines for about 150.