1992 Honda Accord 2.2 auto whoas

We purchased a 92 Honda Accord with the 2.2 from an individual who had recently, supposedly changed the head gasket on the car and was needing to upgrade to a larger vehicle with a baby on the way. It was exactly what we were looking for and was in our range. Car ran fine, heat blew as did the ac. I started to notice little drops of coolant and that when ran long enough the temp would get a little high. I assumed maybe bubbles in the system, the guys said they never flushed or burped it. So I went ahead and did a complete flush and new thermo just for safe measures and got all the air out. But I still found drops and found that it was coming from the overflow tank. As the vehicle heated up, it would somehow over pressurize the cooling system (from bad head gasket I’d assume) and pushing all the fluid into the overflow and then onto the ground. Then once the car gets shut off and sits til later or next day, it’s hard to start. I assume bc the cooling system is depressurizing through the cracked gasket into the cylinder. When I keep the radiator cap off or loose, to keep pressure down, it doesn’t push into the overflow and starts just fine after sitting for same amount of time.
So at this point, I don’t know whether they actually changed the gasket or did it wrong or worst case scenario, the heads warped.
I’m pretty familiar with the Toyota 22re’s and would have no hesitation tearing a head down on it. But have never done this kind of work on a honda. What’s the likely hood of the head being warped? Is it common on these motors with overheating? Or is there maybe something that a person could have overlooked or done wrong if not familiar with this motor. Lastly, where could I find some how-to info on this job?
Tia!