Slant 6 Steel Head Gasket.......

Holy Frijole! Let me measure mine....
.020 on flat spot (dirty) and .027 across compressed fire ring. So those bade boys are .040 uncompressed! With the 70 ft/lbs (dry) torque on those bolts they have a clamping force of 9,550 lbs. If you lube the bolts and torque them to 70, that increases the clamping load to ~11,700 lbs....!
I wonder if you could take a .012 stainless wire under those fire rings and beat a new .040 onto them with a rubber mallet? Or just run it again with some copper spray.