Dis you have the cylinder heads checked for flatness at an automotive engine machine shop and machined flat if they were not flat? Did you apply Teflon thread sealer before torquing the heads down?
You could have not followed the head bolt torquing sequence correctly, the head could have been damaged or warped when the engine over heated.
It's probably the radiator.
water pump. fan. radiator. belts.
Have you checked the radiator or thermostat?
Is an old Honda 91 accord I changed the head gasket and spark plugs and some hoses the car was overheating prior to this now the new head gasket is installed and the hoses and spark plugs and is still over heating
