Fitzgerald gaskets were used by GM in the '60's and '70's. Here's a blurb from Butler Performance, who evidently bought the original dies from GM:
"Manufactured exclusively for BP from the original Fitzgerald dies used for GM in the 1960's and 1970's. These head gaskets will crush to approximately .045. Recommended installation: spray the metal side lightly with copper coat and let dry about 5", spray lightly again and let dry. The metal side goes to the block & the composition side goes toward the head. Do not spray the composition side."