273 Supercharged...ITS HAPPENING PEOPLE!!

IfItsGotWheels said
They may be pricy, but as far as I know the only head gaskets that fit "PROPERLY" are the Cometics. Their gaskets come in a 273 bore with different available thicknesses.

Just make sure the block and head surfaces are finished properly. If they are too rough the Cometics won't seal properly.