The G.M. ones can be heated & formed a small amount to fit. They do help. I lightly glue the gasket to the head over the 4 studs, install cover, reinforcements & nuts.
added photo.
BC 1960 Chevy C10 driver 261 T5 4.10 dana 44 power loc 1949 GMC 250 project in waiting 1960 C60 pasture art Retired GM dealer tech. 1980 - 2022
