head gaskets for 340

Cometic told me I could reuse them after cleaning them and with a light coat of copper spray coating but they also had to be used with the same heads and block they were originally used. Could not be reused if I was changing the heads. I tried it and they have been fine on my engine and I have 11.0 compression. Mine are also .080 thick. I did buy another set just in case but these old ones have been fine for going on three years now.