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Regarding...."or are those seals with the metal tension ring around it just fine?" These are the more desirable. Now, do you have them?
 

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For how long did you perform the cooling system pressure test?
When checking for a head gasket leak, let it sit under pressure for at least 30 minutes. Then remove all the spark plugs, crank the engine, and look for evidence of water being pushed out the spark plug holes.

You can also try topping off the radiator and running the engine with the cap off. If you see bubbles in the coolant while the engine is running that could indicate a head gasket leak.
 
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