Is my engine seized (200ci ford)?

[Mr_66_Mustang]

Ok, my story starts with my 66 mustang with the original 200ci i6 in the engine bay. Any way, I've been restoring it and have now started rebuilding the engine. Since begining the restoration, i have tried to fire the engine once. But, ( i stupidly ) pulled the head and put a new gasket on without checking to see if i took the old head gasket off. Anyway, we tried to fire it up and found it had a bad coil, so i replaced the coil and tried to start the engine again, but this time it wouldn't budge. The starter wont engage and when i tried to turn it over by hand, it wouldn't budge. So i took the head back off and thats when i found two head gaskets on it by my mistake. Also, i found some coolant in the oil ( which i think is caused by the double head gaskets ). This leads me to my questions.
1. Will two head gaskets damage the engine?
2. Is the engine seized, and if so how to fix it?