Have a 1994 honda civic keeps overheating had new t-stat new fan relay switch head gasket been checked been pressure tested all good, doesn't have a air block has no water leaks but still is overheating

Hmmmmm... you forgot to change the Engine Coolant Temp Sensor.

You may need a new radiator, due to phosphate scale. This link should help:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-3.html#post235973