99.5% of the time the head has nothing to do with the overheat, rather it cracks as a RESULT of the overheat.
So you fixed the head possibly, you still have to fix the overheating problem which is most likely a separate issue. If you are a loss then so are we, there are textbooks written on what needs to happen to stop overheating, you have apparently never read one since you give no mention of whether rest of system working or not here. Meaning you might not even have enough water in the motor, we cannot know based on your text.
Strongly suggest you cull the threads here for the various causes, quite frankly we don't have a week of time to instruct you fully.
Parts that must be working correctly are radiator, fans and all their controls (a book all by itself), water pump, all hoses, and system must be properly pressurized. Other reasons to but more far-fetched. You actually should have had all that done before going into the motor.........now you risk breaking new parts. Entirely possible too you may have yanked a head that didn't need to be yanked.
Good luck, you'll need it.