I am thrifty and have, in a emergency situation, reused an old head gasket.
and in 50% of those cases, it worked till I could get a new one.
That said,
Since you have resurfaced the head and it is now flat, the old gasket will not conform to it and it will leak.
Also you stated you already re tightened previously, so that just adds to the fact you need a new gasket.
Why you are so stubborn to the advice of helpful people here, I don't understand.
And when you do get a new gasket, and torque it properly, in the correct sequence following the service manual,
Then warm it up through a couple of heat cycles and re torque it again in the proper sequence,
that procedure ain't in the book.
But experience has taught us if you don't retorque, it leaks sooner rather than later.
If you don't have a torque wrench, borrow one from a friend or auto parts store.
