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155 is normal compression for a det.
Again with the car cold, keep it off, fill it up, burp the hoses, start the car and see if the coolant goes down, fill it up again, let run until full operating temp is reached, toping off and burping the hoses as you go until the thermostat opens. You should see the coolant in the radiator start to flow through when the thermostat opens. If that doesnt happen then its not opening. Also if it hasnt opened and your temp needle just keeps rising then it may be that your temp sending unit is bad and its not really overheating.
What are you basing the overheating on?
If its not bubbling as its running and maybe giving it a little throttle then headgasket is still good. It doesnt have to be mixing water and oil to be putting exhaust gases into the system. But you will see a bunch of small bubbles if its doing so.
Again what are you basing the overheating on.
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